Відео

Believe it or not, you’ll have a larger voltage drop using thin copper for the battery assembly. It’s best to use thick nickel plated copper, you’ll avoid corrosion and you’ll have the higher conductivity of copper, but again, you have to use thicker copper, you should be using copper strips with the same cross area size as the proper AWG wire you would use for the battery pack connections.. I’m guessing probably 2-6AWG wire? So look up the cross section specs of those wires and then find the same sized, or bigger, copper bar/plates to make your S/P battery connections.. you’ll see a much smaller Voltage drop and you’ll keep temps lower longer.. Voltage drop is directly relative to the circuit/wire resistance.. Lower voltage drop and lower operating temperature go hand in hand due to the amount of resistance the battery has and the circuit material/design comes into play.. you can just measure the resistance of your materials ahead of time to find the best choice.. Silver or even gold solder will also lower the resistance. Using a welder to assemble the battery packs is a horrible technique for keeping the resistance as low as possible.. think about the small contact points the welder will create.. Get some low temp solder made for batteries, or like I said, use silver or gold solder material..

If you have some extra space, then add more cells to accommodate the voltage drop, then you can realize the true power potential of the motor…

Yeah, P45B was the best, until the Ampace JP40 comes into the picture, and for just $1.50 more per cell at max.. The JP40 has much better internal components and better manufacturing processes. I’m curious to see if you ever build a JP40 pack… Also, where are you purchasing these batteries? There’s a lot of fakes out there..

Yeah, P45B was the best, until the Ampace JP40 comes into the picture, and for just $1.50 more per cell at max.. The JP40 has much better internal components and better manufacturing processes. I’m curious to see if you ever build a JP40 pack…

So, one of the reasons why the 50% point for voltage isn't the 50% point for capacity is that you're using more-or-less constant power. W = C*V, of course, so to get constant power while decreasing voltage, you have to draw an increasing amount of current. C = W/V. The capacity of the battery is in mAh, so you're using up that capacity more quickly as the battery discharges if you keep the power constant. Current and watts are both rates (coulombs per second and joules per second). The true "midpoint" as a function of time can be determined with some basic calculus. It's going to be higher than the voltage midpoint because of the increasing current over time. I don't feel like doing the math right now, but I suspect it's going to be approximately the value you measured experimentally. There are some other factors due to resistance and battery chemistry and whatever, but that's a major one. This is just a fundamental fact about the relationship between power, voltage and current, so it's not some sort of battery capacity conspiracy or anything. Even though it's counter-intuitive, we shouldn't *expect* that half voltage equals half capacity. Probably most things that display a capacity estimate just assume a linear relationship between voltage and available capacity, just because it's easier and "good enough", but it's not the right formula if you want to know the capacity in constant power. This contrasts with the sort of calculation you'd do with gasoline or something where you might know the volume of gas remaining (directly convertible to watt-hours). Half a tank is half the tank. You don't need more gas to push the gas harder or anything weird like that. There may be contexts where you actually want constant current instead of constant power, and that would work more like gas in the tank. (it's a long video so I may have missed a discussion about this).

Which cells should I pick if I want battery longevity? The BAK 45D or Molicel P42A cells (both have almost identical price). My system draws a maximum of about 60 Amps, and I want to build a 10s3p battery. I appreciate your expert opinion(s)! Thanks

did you make notes what Ah we get if we discharge only down to 3.0V ???

Watched it again, gets better each time 👍 Looking at building a pack for my DeltaWing trike electrification conversion. Using the AmpAce 100V 27S/10P. Big project but winters are long here in Canada 🤣. Interesting about your thoughts on the Samsung 50S, very popular in the EUCs for the high power demand wheels. Thanks again for such fantastic details on your videos. You are the best I've seen so far. May Ukraine keep its freedom and its people have peace and prosperity that all deserve. Best wishes to you and yours

Those copper nickel busbars are super nice. A reusable design too.

Crazy cool :D Very nice bikes you have built!! I´m also a Canyon fan :D since 2006

Just for sharing if anyone is interested: Tests of CoolWatts: P45B after 3sec is 3,53V/cell and at 1 min 3,39V @39,0°C, 2 min 3,30V @51,8°C BAK after 3sec is >3,65V/cell and at 1 min 3,48V @36,1°C, 2 min 3,41V @52,4°C JP40 after 5sec is >3,68V/cell and at 1 min 3,56V @36,0°C, 2 min 3,45V @44,2°C (starting at 4,19V) Test of DIY 500AMP EVE PL 33A 3,82V/cell, after 20s and then 40A 3,57V/cell, at 1 min 3,52V@30,8°C, 2 min ca. 3,41V @40,0°C (but what´s annoying is voltage starting at 4,27V on the tester..) JP40 33A 3,74V/cell, after 20s and then 40A 3,60V/cell, at 1 min XX V@29,7°C, 2 min ca. 3,47V @37,5°C (starting at 4,23V) Tabless running surely much colder! JP40 much colder, on performance a bit better than EVE and BAK

PLEASE test the FARASIS NCM battery Can i purchase for you to test??

Looks sick!

already flying 6s2p and they outperform sams 30T which are known for low ir

Ah there we go, wave of tabless cells incoming!

suggestion - mount camera on a stand pointing down towards table - then move spec sheet paper around on table to show specs - easier and better -

Another great test 👍

would be the best if you made thicker bus bars for the higher power ampace jp40 batteries (atleast with the same 22s9p configuration)

Magura Brakes are super! I used them when I was an amateur mountain bike racer. Now being caught by RC modeling and flying jets xD

Well on 40A P45B is 3,53V and at 1 min 3,39V @39,0°C, 2 min 3,30V 51,8°C //// BAK >3,65V and at 1min 3,48V @36,1°C, 2min 3,41V @52,4°C understand. But this results are already very good for me. Lucky your prices are better for Ucrania. Also the P50Bs had a strange price list when you did the video. For 10 pieces and 11 pieces really cheap. Here for Germany €7,45 for 10-49 pieces... Thanks again!!

I did not expect them to compare to the JP40s, I wonder how BAK 40D will perform.

Nice analysis! I was about to hit the "order" button on NKon. I´ve been experimenting a bit with P45Bs after I did some dissapointing tests on 40t or scams. The Molicels are spectacular for me flying electric model jets. The power/speed is quite good, only around <10% less than my best LiPos. The temperatures on my mixed usage is very low but I haven´t measured it. At 47A (full throttle over 2 Min they get pretty warm, but on normal flight that is much lower). I would just wish a bit lower voltage sag so I was looking for your other tests the weeks before. This cheap tabless may be a little bit better than my P45Bs while having a similar capacity. Ordering JP40s is quite expensive just for testing while the cells would cost around 6-7$ piece for 30-50 pieces. Mmmm need to watch your 40A test again to have a feeling... On 47A I had a voltage drop to 3,45V/cell on my pack 6S1P... Thanks for sharing your results!!!!

Hey nice! I was just looking today for the specs of this and got the datasheet from NKon

Would this work for the surron light bee x? since im planning on buying the chinese version due to the cheaper price and ill be fully upgrading that beast

Can you make a video how to get all the wires to fit into the bike

V. Vehicle I. Identification N. Number

Wow thanks for so much info. I just purchased an X1 Pro Gen4 and am planning something similar with a DH or Enduro bike. Have not found the bike yet - keeping looking for used bikes but not in an area with long travel bikes so I might buy new, maybe even just a frame and build not sure how much money I want to waste lol. Edit: I support Ukraine💛! You are probably building drones?

2 belts!… niiiice.. can’t wait to see this.

does it have pedals 😂

POV: me looking at my new bike knowing it’s never going to be this clean again

Great job bid dawg

What’s your opinion on 20kw with a 219 chain you think it’s going to snap ? 16/19 Mx wheels

Where did you get sample for P50B?

Beautiful build.

That's amazing! Glad that I found this channel, a lot of useful information, I will use it when designing my battery

👍

Fantastic 👍

👍 If you get a chance to learn EUC, give it a try, next level in trail riding 😁

Great build 👍

Any interest in testing BAK 60A from NKON? Apparently tabless also.

Hi! I have been watching or hearing in the meantime when I was repairing a plane. I missed the part about the lower or hyped performance of the P50Bs. I have began to use P45B on my RC jets and they work pretty good with loads of 50-60A continuous with some ventilation. As the P50Bs are now or will be on stock on NKon I´m wondering if I should take one of those... Could you just tell me if the discharge rate and heat are better or not as the P45B? I´ll to check it out again... You live in the Ucraine but have a very US-american accent. I hope you are doing well! And I´m just curious what you do there and how the life is. I wish you the best and thank you very much for this tests, which I enjoy a lot since a couple of years I worked as a scientist for concrete technology :D

Really appreciate the video but not sure what you are talking about with the 40PL having disappointing performance? Quite a sweeping statement that is at odds with the data from mooch.. apart from that we now know the cycle life to be excellent. Some questions hanging over the ampace cells with a large loss when stored. Could screw up a whole pack if multiple cells did that

Cool! Looking forward for your video and analysis. I began to use P45Bs since the P50 aren’t on stock in Germany still

sick build!!

THIS is unprecedented. tabless technology is huge we will achieve electrification

Looks like your initial Ir results are reasonable based on some quick math around the 60A test. The P45B heats up 26C in 1 minute of testing with a datasheet 15mR of Ir. At 60A that's about 54W of Ir dissipation. If we assume an identical *C/W of temperature increase for the JP40 (0.48*C/W), that gives us about 36.8W of Ir dissipation. At 60A, 36.8W of resistive dissipation equates to... 10.2mR. Its not a perfect comparison, but it should work as a good sanity check for your testing.

Make a long version!! 😁👍

That's great they can output such high current but how do you connect the battery in such a way to enable that much current without getting the wires/strips hot?

Thanks for the detail really inspiring looks awesome