Hi Jim, I have a Dillinger motor bike, I wasn't aware that I had to charge my bike, now after 6 months, it not working...what can I do to get this battery charging again without have to buy another...Please help me. Thank you, Mary
Hi I purchased a fully fitted bike on a auction which has a 36volt battery pack fitted . The BLDC Motor controller specifies its a 6-- Li 36--14. These are the only specs available. What I need to know is what type of charger can I use? Besides the usual lead acid 6/12v charger which would be useless I suspect but also have a charger used for a printer that has a output of 32 volts . Can this be used ? If not what type of charger should I acquire? TIA regards
Thanks Jim, this is the best video i have watched till date . u spoke about all that it needed , this video really helped me. Knowledge is wealth as per my understanding , thanks again for sharing your knowledge . Hari.
Very informative, Thanks. Many E-Bikes have proprietary batteries (cases, that only fit on specific bikes, and are expensive to replace, not to mention difficult to find. Could you please make a video on how to remove, and replace Cells in an E-bike battery. This would potentially save riders time and money. Thanks, Brooklyn Brett
+DjK Productions Lithium batteries . are another world away from nicad or other rechargeables.They are critical in charge and discharge volts. When I see people store and use them in canvas bags or plastic boxes I cringe .Try holding a 100 watt lamp in your hand when it is alight. Then consider how much heat is dissipating when running 500 watts or greater on your bike.
I have a new 48V 1000w ebike kit with 48v 1000w controller. What I need to know is what size Lipo batteries would I need to run the 48v 1000w motor at top speed and to give me close to 30 miles distance one way. I was told by HobbyKing that I would need wired in series (2) 10000mah 6s 15c 22.2V (222 Wh)
Glad you enjoyed it! Was neat to speak with someone like Jim who has years of experience in the space and a strong background in mechanical and electrical engineering.
Very useful stuff Court and lots of folks can now make more informed choices about bikes and decisions about use. I also think that we need to keep in mind that technology isn't a static capability and that some solutions are more open to adaption than others, and that as time passes, those more open solutions will have lower costs. Now if I could just play my cool eight tracks easily...they aren't totally obsolete but are hard to access. My guitar still works though.
The technical information is great - cannot fault Jim's explanations. Amazing to think a battery pack is made up of so many cells. Scary - so many cells in series and parallel - held together by electronics - one cell fails and I wonder, do you lose one bank?
I am curious i am going to build an electric skateboard, it uses a dual 170KV, 3200watt, 80Amp motors. i weigh about 180 ibs. I am planning on building a battery pack with 50 cells that are 3.7v 850mah. How would i figure out how far that will take me?
Man... I have no idea! Hopefully an electrical engineer will chime in. You might have some luck messing around with this tool: www.ebikes.ca/tools/simulator.html
They are 6.4 kv so not that over powered. It is for a longboard skateboard, plus I think u underestimate my abblity to travel at high speed on a longboard. I Race longboards
Good explanation especially that watt hours are the most relevant measure. Jim could have clarified that Amp hrs X Volts = Watt hrs by writing it on the board. Battery University says that a Lithium battery shouldn't sit after being fully charged--it should be used or at least used a little to take it off the peak of full charge so it will have a bit less self discharge which degrades batteries.
Al M Yeah, I try to mention battery care in my reviews here and there. I'll continue sharing the best practices (and making sure I've got them right from guys like Jim and people who share here in the comments :)
Thanks for great info on batteries. I want to DIY batterypack and wanted good information on the subject. and you brought it :D thanks for that. And btw i dindt get bothered by cameraman as other did. keep it up ^^
18650 cells have really come down in price, yet we see no real decrease in the price of pre-built batteries. The E-Bike makers are shooting themselves in the foot. There is no reason you can't build a 1/2 decent E-Bike for < $1000 with an 800WH battery and an entry level bike. DC motors are a dime a dozen. The E-Bike industry is just ripping people off. 5k for a damn bicycle is outrageous. If they would start mass manufacturing these things, we would see a dramatic drop in the price and people would buy them.
I Build my ebike for 210euros. Motor at rear wheel, 36v li-ion battery from aliexpress. I have measured 1117watts uphill. Good acceleration and 25mph top speed. I'v made two batterys out of used cells I got for free.
There are one thing he didn't mention: Lithium iron phosphate are the famous nano phosphate batteries from a123system. Those batteries were famous for being able to handle a rapid recharging. 15 Min for 80% capacity. To bad that the market isn't taking advantage of that and offer a fast charging solution.
Am not totally sure , from the interview quite how this applies to a ( lithiam ion) battery , they seem to last well my friends ebco battery is 3 years old and still lasting ,but there's so many ( meant to be best ways to care for your battery) it's hard to know should you just leave it plugged in and let the battery look after its self , as inside it is meant to have a management board . It's a shame there only 8.8 amp . They do have a bat management system as I said , but I think cost far to much ,the 11 amp is I think 450 , and with chargers at 95 pounds . , sorry but the feeling that you are being ripped of is strong .
About capacity, is a 36v/12ah battery (like on e-motion) longer lasting, but less powerful (voltage) than a 37 Volt 10.5 Amp-hour battery? At first, I thought greater voltage means greater pressure therefore it will burn faster?Electricity is the final frontier!
Technically it depends on how many amps the system is operating at but yeah, higher voltage = more torque and power and more amp hours = longer range (if everything else is held constant including the bicycle wheel size, tire pattern, weight, motor type, rider, terrain and weather)
An 18650 battery is NOT 18 millimeters around, it has a diameter of 18 mm. Lithium-phosphate batteries (LiFePO4) can be recharged many times more often than Lithium-Cobalt and that's another reason e-bike manufacturers don't use them often. They make a lot of money by selling the batteries. Think of it, a Lithium-Cobalt battery can be recharged about 400-800 times. This means if you charge it daily you need to buy a new battery every 2 years.
Still this doesn't help. Say we have a 37v battery at 17Ah the total wattage would be 612 watts. First question how long can these 612 watts run a 250 watts motor vs the 350 watts motor..? Second question if the 250 watts motor can go farther with these 612 watts then why do people upgrade to 350 watts motor..?
For more torque and or more speed. The higher the volt or the watt of the motor generally will have more torque or higher max speed depends on how the motor was built. It's a trade off.
Cameraman too close to mic compared to Jim and interjecting "got it" and "Huh" adds nothing but annoyance to what otherwise looks to be a useful video. I gave up at 7 mins in as found these interjections just too irritating! Gave it thumbs down because of this....
Thanks for the feedback, I was shooting on a camera phone and this was an unplanned interview. New equipment is better and I'm working on my interview skills. I gave you a thumbs up for helping me with critical feedback :)
Stop whinging,the subject matter was fascinating.I learned a lot from this,I heard every word clearly,and I found the interviewer,asked good questions.Why do so many people have to find negatives on every UA-cam video I watch.If I could I would take that comment like you have been awarded,and shove it up your ass.Lol
+All Bike Update I wasnt annoyed by it, I think you have a nice voice and those little remarks made me feel as if I 'm there listening to the guy with you. If Rob gets annoyed by a few "yes", he should take anger management courses before he even walks out the door, because there are much more annoying things in life. PS. Jim explained the shit out of this stuff. I wish I have had teachers like that.
Thanks for the feedback, our interviews here were unplanned... just seemed like fun. I've bought nicer cameras since then but am a one person team and have been trying to grow slowly without selling out or using debt :)
Electric Bike Review The video is fine, the view is fine; people are spoiled by television and movie production. What is better? A 20 min interview with Jim or no interview at all.
Mega Mechatronics Thanks, I'd love the videos to be perfect but it's true... There is a trade off in what it costs me to hire someone to hold the camera and the time it would cost to edit vs. just doing it with a basic camera (even buying nicer cameras adds up) so I just do my best and am trying to get better over time :)
As great as the battery info is in this video, this guy works for a company that sell bikes that START at $3000! I could buy a cheap used car for that much! The high end Optibike sells for $14,000!
+Minecraft And More Actually, that's way too simplistic. When fully charged, the cells will be at 4.2v and, if you run them to shut-off, they will only be 2.5v. Calculate that, why don't you!
Voltage is represented by a E not a V. E is electromotive force and is a measure of "potential" relative to some other voltage, usually on Ebikes, which would be 0 Volts or ground. He needs to stop talking in silly analogies and talk about what electromotive force is, what current is and what power (P) is. Despite what you may have heard, Power is what drives your electric motor.
Cool, it sounds like you've got a pretty good handle on all of this. Am I correct in saying that voltage is like power and amp hours are like capacity but you still need a motor capable of higher watt output to leverage higher voltage? I'd love a clear concise explanation about battery volts and amp hours along with amps and also motor watts.
ElectricBikeReview.com Not really. Using a low voltage motor would make it heavier though. Raising the voltage allows more power (watts) to flow through a much thinner wire. Voltage doesn't heat up a wire and you can put thousands of volts through a pretty thin wire. By jacking the volts up, you need less amperage which means you can use thinner wires in your motor. Because you can use thinner wires in your motor, you can get a more responsive motor using a higher voltage and put many more windings in a given space. Bottom line is it take X number of watts to do Y work. Sometimes it's more efficient to get X watts using a higher voltage and lower amperage and in some cases it's better to use higher amps and lower voltage. A major downfall to very high voltage bikes is that it takes so many cells to reach that voltage and the more cells you put in series (to get the higher voltage) the more chances you have of a mismatch between the cells, which will cause cell reversal and permanent loss to that cell which makes cell reversal even more likely. Another problem with using high voltage DC is how dangerous it is (though I don't think I've ever seen a bike higher than 72V which is not fun, but probably won't kill you). AC at high voltages, should you touch it, tends to throw you off of it, whereas high voltage DC will lock you muscles completely and keep you on it.
***** All other things equal, it wouldn't make the battery heavier to have higher voltage. Look at like this. Say you were using 10 18650 cells at a nominal voltage of 3.7V and 3AH per cell and you wired them in series, you would have a 37V 3AH battery. If you wired them all in parallel, you would have a 30AH 3.7V battery. Since P=I*E either way you would have a 111WH battery. Now say you want to have a 111 watt motor, if you went with the parallel setup, the wires in the motor (and in the battery and going from the battery to the controller and to the motor) would all have to be thick enough to carry 30 amps. This would mean the motor would be very inefficient at producing torque and would be heavier. If you did the other way, you would need a wire that could carry 3amps which would be much thinner. This also makes the motor more efficient, especially during high torque use when pulling off from a stop or climbing a hill.
tarstarkusz Thanks for breaking it down. Can you help me understand how amps are determined? Could you make both batteries in your example run at lower amps or is that a factor of higher voltage or something I'm missing?
tarstarkusz--Nope sorry, In the Physics classroom voltage may be 'E' but in the real world of an electrician, ebike maker or rider, Tesla or just about anywhere V stands for volts. I don't know why you don't know this because you do seem to know other interesting and relevant things about motors, amps, wires & etc.
Vitalie Vizitiu I have the book 'Batteries in a Portable World" by Isador Buchanan which the website says it is based on. I find no contradiction at all in what Jim Turner says and what Battery University says other than Jim didn't quite mention that a battery shouldn't be left fully charged.
Al M This point has been reiterated to me a couple of times in comments and going forward I've tried to emphasize avoiding a discharge below 20% vs. always charging to 100%. Do you agree with the "stay between 20% and 80%" direction? When should an individual charge to 100%? Only when they are preparing to ride within a day or so?
Optibikes are so ridiculously overpriced. If you know about battery technology you know how much these guys and most vendors are fucking you over. Their bikes have a rediculously puny 400 wh battery and they are charging $5k to $10k. Jesus Christ! You can build an e-bike like mine for about $1500 with a more useable 800 wh mounting shark pack
your cheapest bike is priced at about $2k!!! i could buy a honda civic for $2k and feel little to no remorse for the amount of pollution it creates. you should apply your expertise to lowering the price of your product.
+Andrew Grangruth I hear you,we need to get more people riding bikes,and Electric bikes are the answer,BUT Not if the price of the Bike is more in Cost of a good used Car,How does that help the green movement,think about it yuppies,a lot of Poor people need transportation that is affordable like me,I've been saying this forever,we want to help 3rd world country's w/transportation,How about the POOR Here,Duh
Hi Jim, I have a Dillinger motor bike, I wasn't aware that I had to charge my bike, now after 6 months, it not working...what can I do to get this battery charging again without have to buy another...Please help me. Thank you, Mary
Very good information, I am looking at converting my existing bike into an e-bike and there are a lot of different kits out there.
Hi I purchased a fully fitted bike on a auction which has a 36volt battery pack fitted . The BLDC Motor controller specifies its a 6-- Li 36--14. These are the only specs available. What I need to know is what type of charger can I use? Besides the usual lead acid 6/12v charger which would be useless I suspect but also have a charger used for a printer that has a output of 32 volts . Can this be used ? If not what type of charger should I acquire? TIA regards
Thanks Jim, this is the best video i have watched till date . u spoke about all that it needed , this video really helped me. Knowledge is wealth as per my understanding , thanks again for sharing your knowledge . Hari.
Very informative, Thanks.
Many E-Bikes have proprietary batteries (cases, that only fit on specific bikes, and are expensive to replace, not to mention difficult to find.
Could you please make a video on how to remove, and replace Cells in an E-bike battery. This would potentially save riders time and money.
Thanks, Brooklyn Brett
+Brett Ladin
I would very much like to second this thought as I am facing exactly such a situation.
Do most of the things mentioned here about charging and caring for the batteries also apply to lithium polymer batteries?
Cheers!
+DjK Productions Lithium batteries . are another world away from nicad or other rechargeables.They are critical in charge and discharge volts. When I see people store and use them in canvas bags or plastic boxes I cringe .Try holding a 100 watt lamp in your hand when it is alight. Then consider how much heat is dissipating when running 500 watts or greater on your bike.
I have a new 48V 1000w ebike kit with 48v 1000w controller. What I need to know is what size Lipo batteries would I need to run the 48v 1000w motor at top speed and to give me close to 30 miles distance one way. I was told by HobbyKing that I would need wired in series (2) 10000mah 6s 15c 22.2V (222 Wh)
Excellent video , thanks Mr. Turnery , a well and easily explained video that whomever are into the electric bicycle should see .
Fronzi Approved .
Glad you enjoyed it! Was neat to speak with someone like Jim who has years of experience in the space and a strong background in mechanical and electrical engineering.
Very useful stuff Court and lots of folks can now make more informed choices about bikes and decisions about use. I also think that we need to keep in mind that technology isn't a static capability and that some solutions are more open to adaption than others, and that as time passes, those more open solutions will have lower costs. Now if I could just play my cool eight tracks easily...they aren't totally obsolete but are hard to access. My guitar still works though.
thanks, these are basically all questions i've had.
learned more than I came here for that for sure thanks
The technical information is great - cannot fault Jim's explanations. Amazing to think a battery pack is made up of so many cells. Scary - so many cells in series and parallel - held together by electronics - one cell fails and I wonder, do you lose one bank?
Thank you; great information, clearly expressed.
I am curious i am going to build an electric skateboard, it uses a dual 170KV, 3200watt, 80Amp motors. i weigh about 180 ibs. I am planning on building a battery pack with 50 cells that are 3.7v 850mah. How would i figure out how far that will take me?
Man... I have no idea! Hopefully an electrical engineer will chime in. You might have some luck messing around with this tool: www.ebikes.ca/tools/simulator.html
alienpowersystem.com/shop/dual-motors/alien-power-system-150amp-6-4kw-twin-motors-kit-2
This is wat I am using
They are 6.4 kv so not that over powered. It is for a longboard skateboard, plus I think u underestimate my abblity to travel at high speed on a longboard. I Race longboards
Josh Brown Im done
Good explanation especially that watt hours are the most relevant measure. Jim could have clarified that Amp hrs X Volts = Watt hrs by writing it on the board. Battery University says that a Lithium battery shouldn't sit after being fully charged--it should be used or at least used a little to take it off the peak of full charge so it will have a bit less self discharge which degrades batteries.
Nice, thanks for the clarification about taking a bit off the top (or maybe not charging it all the way to 100%)
ElectricBikeReview.com I think this 'fact' needs to be broadcast big time to help peeps keep their batteries living longer.
Al M Yeah, I try to mention battery care in my reviews here and there. I'll continue sharing the best practices (and making sure I've got them right from guys like Jim and people who share here in the comments :)
Thanks mate., great video!!!! So much knowledge. ☺
great interview..........
Thanks! The audio and video aren't perfect but it was done on the fly and worth sharing. Glad you enjoyed it ;)
can i use any ebike battery to work with a phoenix 2 kit
I'm looking to spend the most $1000 for my e-bike what would u recommend I will be using it to do short delivery in NYC Manhattan
get a radpower bike i bought a radrover but the radcity is best for delivery im seeing them more and more. they're way better then arrow bikes !
Thanks for great info on batteries. I want to DIY batterypack and wanted good information on the subject. and you brought it :D thanks for that. And btw i dindt get bothered by cameraman as other did. keep it up ^^
Great info!
Just subscribed!
thanks for the upload..good info
Very helpful info, thanks.
I always wondered why my lithuim cobalt battery worked longer but wasn't as powerful.
Such a useful video!
Nice! Glad you enjoyed it Brighton, thanks for chiming in. I'll do my best to film other stuff like this and post it in the future :)
so can a 48v 20ah battery run a 3000w motor at full power for 20 minutes?
18650 cells have really come down in price, yet we see no real decrease in the price of pre-built batteries. The E-Bike makers are shooting themselves in the foot. There is no reason you can't build a 1/2 decent E-Bike for < $1000 with an 800WH battery and an entry level bike. DC motors are a dime a dozen. The E-Bike industry is just ripping people off. 5k for a damn bicycle is outrageous. If they would start mass manufacturing these things, we would see a dramatic drop in the price and people would buy them.
Check out this ebike, I think it fits your model pretty well and even comes with lots of accessories: electricbikereview.com/eg/athens-250/
ElectricBikeReview.com
I'll check it out. Thanks.
I Build my ebike for 210euros. Motor at rear wheel, 36v li-ion battery from aliexpress. I have measured 1117watts uphill. Good acceleration and 25mph top speed. I'v made two batterys out of used cells I got for free.
excellent video dude.. :)
excellent tips, thanks
Thanks for the info.
Great stuff!! This helped a lot! :-)
There are one thing he didn't mention:
Lithium iron phosphate are the famous nano phosphate batteries from a123system. Those batteries were famous for being able to handle a rapid recharging. 15 Min for 80% capacity.
To bad that the market isn't taking advantage of that and offer a fast charging solution.
Am not totally sure , from the interview quite how this applies to a ( lithiam ion) battery , they seem to last well my friends ebco battery is 3 years old and still lasting ,but there's so many ( meant to be best ways to care for your battery) it's hard to know should you just leave it plugged in and let the battery look after its self , as inside it is meant to have a management board . It's a shame there only 8.8 amp . They do have a bat management system as I said , but I think cost far to much ,the 11 amp is I think 450 , and with chargers at 95 pounds . , sorry but the feeling that you are being ripped of is strong .
This was good thanks you
About capacity, is a 36v/12ah battery (like on e-motion) longer lasting, but less powerful (voltage) than a 37 Volt 10.5 Amp-hour battery?
At first, I thought greater voltage means greater pressure therefore it will burn faster?Electricity is the final frontier!
Technically it depends on how many amps the system is operating at but yeah, higher voltage = more torque and power and more amp hours = longer range (if everything else is held constant including the bicycle wheel size, tire pattern, weight, motor type, rider, terrain and weather)
Kinda, But there is very little difference between 36v and 37v.
wow, this guy is cool
An 18650 battery is NOT 18 millimeters around, it has a diameter of 18 mm.
Lithium-phosphate batteries (LiFePO4) can be recharged many times more often than Lithium-Cobalt and that's another reason e-bike manufacturers don't use them often. They make a lot of money by selling the batteries. Think of it, a Lithium-Cobalt battery can be recharged about 400-800 times. This means if you charge it daily you need to buy a new battery every 2 years.
Great video! Very informative. Great interview. The guy below me gets a thumbs down 👎👎👎👎👎👎👎👎👎
Still this doesn't help. Say we have a 37v battery at 17Ah the total wattage would be 612 watts. First question how long can these 612 watts run a 250 watts motor vs the 350 watts motor..? Second question if the 250 watts motor can go farther with these 612 watts
then why do people upgrade to 350 watts motor..?
For more torque and or more speed. The higher the volt or the watt of the motor generally will have more torque or higher max speed depends on how the motor was built.
It's a trade off.
thanks buddy
Cameraman too close to mic compared to Jim and interjecting "got it" and "Huh" adds nothing but annoyance to what otherwise looks to be a useful video. I gave up at 7 mins in as found these interjections just too irritating! Gave it thumbs down because of this....
Thanks for the feedback, I was shooting on a camera phone and this was an unplanned interview. New equipment is better and I'm working on my interview skills. I gave you a thumbs up for helping me with critical feedback :)
All Bike Update
oooh, humble. thumbs up, lol
Stop whinging,the subject matter was fascinating.I learned a lot from this,I heard every word clearly,and I found the interviewer,asked good questions.Why do so many people have to find negatives on every UA-cam video I watch.If I could I would take that comment like you have been awarded,and shove it up your ass.Lol
+All Bike Update I wasnt annoyed by it, I think you have a nice voice and those little remarks made me feel as if I 'm there listening to the guy with you.
If Rob gets annoyed by a few "yes", he should take anger management courses before he even walks out the door, because there are much more annoying things in life.
PS. Jim explained the shit out of this stuff.
I wish I have had teachers like that.
Angry much?
I like the video man it is very educational but ......, let the man explain. Got it ? Huh? :) thumbs up from me
pukkarooneeey jim & co
Very annoying the guy talking over the professor, but still the video is useful
If this is what you do, then get some lights and a remote mic. Your voice overpowers the subject's.
Thanks for the feedback, our interviews here were unplanned... just seemed like fun. I've bought nicer cameras since then but am a one person team and have been trying to grow slowly without selling out or using debt :)
Electric Bike Review The video is fine, the view is fine; people are spoiled by television and movie production.
What is better? A 20 min interview with Jim or no interview at all.
Mega Mechatronics Thanks, I'd love the videos to be perfect but it's true... There is a trade off in what it costs me to hire someone to hold the camera and the time it would cost to edit vs. just doing it with a basic camera (even buying nicer cameras adds up) so I just do my best and am trying to get better over time :)
Electric Bike Review
Thank you for your work and your response. This validates that having an input for a remote is essential for even casual use.
Bobcatt22 And maybe a tripod and lighting? I don't think it's essential but it would improve the footage and add to the experience. Thanks Bobcatt22.
the bottom line is , battery power is very expensive energy .
As great as the battery info is in this video, this guy works for a company that sell bikes that START at $3000! I could buy a cheap used car for that much! The high end Optibike sells for $14,000!
Tesla has a new battey 2170.
@51 seconds, a 37v volt lead acid battery? I didn't watch anymore
+Steven Ruscoe yeah.. 3 12v batteries in series.
the video is informative but it mostly to long. that goes into a sales pitch.
its 36 volts
actually there is though 10 lithium cells would be 3.7 x 10 calculate that
+Minecraft And More Actually, that's way too simplistic. When fully charged, the cells will be at 4.2v and, if you run them to shut-off, they will only be 2.5v. Calculate that, why don't you!
Voltage is represented by a E not a V. E is electromotive force and is a measure of "potential" relative to some other voltage, usually on Ebikes, which would be 0 Volts or ground. He needs to stop talking in silly analogies and talk about what electromotive force is, what current is and what power (P) is. Despite what you may have heard, Power is what drives your electric motor.
Cool, it sounds like you've got a pretty good handle on all of this. Am I correct in saying that voltage is like power and amp hours are like capacity but you still need a motor capable of higher watt output to leverage higher voltage? I'd love a clear concise explanation about battery volts and amp hours along with amps and also motor watts.
ElectricBikeReview.com
Not really. Using a low voltage motor would make it heavier though. Raising the voltage allows more power (watts) to flow through a much thinner wire. Voltage doesn't heat up a wire and you can put thousands of volts through a pretty thin wire. By jacking the volts up, you need less amperage which means you can use thinner wires in your motor. Because you can use thinner wires in your motor, you can get a more responsive motor using a higher voltage and put many more windings in a given space. Bottom line is it take X number of watts to do Y work. Sometimes it's more efficient to get X watts using a higher voltage and lower amperage and in some cases it's better to use higher amps and lower voltage. A major downfall to very high voltage bikes is that it takes so many cells to reach that voltage and the more cells you put in series (to get the higher voltage) the more chances you have of a mismatch between the cells, which will cause cell reversal and permanent loss to that cell which makes cell reversal even more likely. Another problem with using high voltage DC is how dangerous it is (though I don't think I've ever seen a bike higher than 72V which is not fun, but probably won't kill you). AC at high voltages, should you touch it, tends to throw you off of it, whereas high voltage DC will lock you muscles completely and keep you on it.
***** All other things equal, it wouldn't make the battery heavier to have higher voltage. Look at like this. Say you were using 10 18650 cells at a nominal voltage of 3.7V and 3AH per cell and you wired them in series, you would have a 37V 3AH battery. If you wired them all in parallel, you would have a 30AH 3.7V battery. Since P=I*E either way you would have a 111WH battery. Now say you want to have a 111 watt motor, if you went with the parallel setup, the wires in the motor (and in the battery and going from the battery to the controller and to the motor) would all have to be thick enough to carry 30 amps. This would mean the motor would be very inefficient at producing torque and would be heavier. If you did the other way, you would need a wire that could carry 3amps which would be much thinner. This also makes the motor more efficient, especially during high torque use when pulling off from a stop or climbing a hill.
tarstarkusz Thanks for breaking it down. Can you help me understand how amps are determined? Could you make both batteries in your example run at lower amps or is that a factor of higher voltage or something I'm missing?
tarstarkusz--Nope sorry, In the Physics classroom voltage may be 'E' but in the real world of an electrician, ebike maker or rider, Tesla or just about anywhere V stands for volts. I don't know why you don't know this because you do seem to know other interesting and relevant things about motors, amps, wires & etc.
This guys doesn't know what is talking about...
Which parts did you disagree with Vitalie? Feel free to elaborate or share corrections.
Please read through batteryuniversity.com/ Li-Ion chemistry. This way you will better understand.
Vitalie Vizitiu That's a great website! I check in there every once in a while. Thanks.
Vitalie Vizitiu I have the book 'Batteries in a Portable World" by Isador Buchanan which the website says it is based on. I find no contradiction at all in what Jim Turner says and what Battery University says other than Jim didn't quite mention that a battery shouldn't be left fully charged.
Al M This point has been reiterated to me a couple of times in comments and going forward I've tried to emphasize avoiding a discharge below 20% vs. always charging to 100%. Do you agree with the "stay between 20% and 80%" direction? When should an individual charge to 100%? Only when they are preparing to ride within a day or so?
MY HERO ! NOT!
Optibikes are so ridiculously overpriced. If you know about battery technology you know how much these guys and most vendors are fucking you over. Their bikes have a rediculously puny 400 wh battery and they are charging $5k to $10k. Jesus Christ! You can build an e-bike like mine for about $1500 with a more useable 800 wh mounting shark pack
GREED AND RIPP OFFS!
ss macumba or black mason quimbanda? kkk pluriguud
His hair bugs me.
He needs to just shave it off..
your cheapest bike is priced at about $2k!!! i could buy a honda civic for $2k and feel little to no remorse for the amount of pollution it creates. you should apply your expertise to lowering the price of your product.
+Andrew Grangruth I hear you,we need to get more people riding bikes,and Electric bikes are the answer,BUT Not if the price of the Bike is more in Cost of a good used Car,How does that help the green movement,think about it yuppies,a lot of Poor people need transportation that is affordable like me,I've been saying this forever,we want to help 3rd world country's w/transportation,How about the POOR Here,Duh