Morten if you have cells that are more than about 0.1v difference from each other, many BMS disable charging (and usually discharging) because this kind of difference means the cells are not balanced and the BMS is designed to assume this means there is a pack problem. You might want to charge each cell group to a voltage that is the same across all, then try to charge by using the charger. Hope that makes sense and works for you. *Cheers*
Just thinking - the key-switch has two functions On/Off and Yes/No removable - the Off and Yes positions will only disable the load-mosfets and have probably no influence on the charge-mosfets. However according to your description - the charge leads are just connected to the multi-sleeve connector and not to the battery pack - indicating the charge port can only be used with the battery inside the bike or with a battery sleeve cover shorting the charge leads to the battery leads - correct me if I am wrong
I don’t have any experience or advice about the BMS. However, I know you could automate your bench supply operation. Considering that the battery pack is rated 10 Ah, for lithium polymer cells, you could do as much as 10 A charging (that 1C, where C is the capacity). When you start the operation, just set the bench supply Current Limit to anything below the 10 A and voltage to 42 V and it will take care of the rest. Actually, I think your bench supply current capability is less than 10 A. But whatever, you can depend on the resulting constant current charging. Maybe you like better a 0.1C setting, which in this case means 1 A current limit on the bench supply. So, you would let it go at the 1 A current, until eventually the bench supply changes to voltage limiting mode from the current mode at 42 V. Never mind the power reading - fixed 1 A current would produce growing power with the growing battery voltage, until the 42 V, when the current will drop to something near zero. Unless the BMS is already active doing something I don’t know.
Hi, sorry just have to make a correction to a statement you made, there is no over charge from the charger at all. Your battery is a 10S 10S x 4.2V = 42V. The other thing is, the current will be divided by the number of cells in parallel. If as you say there are 4 cells / 2000mA or 2 A = 500mA or 0.500A per cell.... There is absolutely no overcharge or over powering from the charger... Nominal voltage of Li Ion cells is 3.6V full voltage is 4.2V....
take your tester in position, 20A DC and with the test leads make a short on the less batt and less chargin /motor having connected your power supply, for 10 minutes or more
@@MyPlayHouse if you look at a BMS connection diagram, you will see that the negative pole is interrupted with mosfets, both for charging and discharging with the tips of your tester, on the 20 or 10 A DC scale, connect the two negative wires B- and C- with the 42 volt charger connected you will see that your battery charges even if it is at 9 volts. after 30 volts, your BMS will start working normally again the one you have spelled with your power supply, is fine up to 42 volts, but a check of individual cells after a full charge and a two-hour break, you should find them all at around 4, 15 volts depending on the quality of the cells good anyway
BMS won't reset battery untill battery reaches 42v and remains there normally less than 10min sett PSU for 42v 2amps and just leave it it can't over volt as you are only supplying 42v worked fine for me. I did it lazy way I never took battery apart I just used power pins.
Well its charging now, but it's a picky sod. I've seen chargers that seem dead and leaving it on charge over night often wakes it up. I hate the batteries that become impossible to charge for no reason :-(.
Not battery related. It looks like the grips on the handlebar are on the wrong side. If it is a nice relaxed curve on the bottom side, then swap the left to the right and the right to the left. It will be more comfortable on longer rides. Battery related... You need to be cautious of these Chinese batteries. There are no safety protocols for a lot of them. Many people in the US have died because they have gone up in smoke. There are several blocks in the NYC that have burned to the ground because of this. Several bike shops gone. I work in a bike shop in NH and we will not let a customer that brings in one of these off name brand of bikes into the shop leave the battery. They have to take it with them. We will work on the bike and make it work but will not touch the electrical system. We only work on the e-bikes we sell because the companies we rep do take battery safety seriously. A lot of people that buy these Chinese bike will park their bike by the door while changing. If it goes up in flames (and these batteries go up in flames super fast) you most likely wont get out unless you have a second exit. This smoke is very toxic. Good luck getting to the second exit.
Morten if you have cells that are more than about 0.1v difference from each other, many BMS disable charging (and usually discharging) because this kind of difference means the cells are not balanced and the BMS is designed to assume this means there is a pack problem. You might want to charge each cell group to a voltage that is the same across all, then try to charge by using the charger. Hope that makes sense and works for you. *Cheers*
I know this,, and all the cells was within 0.012v so I do not think this was it :-/
Just thinking - the key-switch has two functions On/Off and Yes/No removable - the Off and Yes positions will only disable the load-mosfets and have probably no influence on the charge-mosfets. However according to your description - the charge leads are just connected to the multi-sleeve connector and not to the battery pack - indicating the charge port can only be used with the battery inside the bike or with a battery sleeve cover shorting the charge leads to the battery leads - correct me if I am wrong
From the charging port it goes to two pins on the 5 pin "multi-sleeve connector" (Pin 2 and 4) and then to the battery.
Worst case scenario, you will have to buy a new BMS for that amount of cells configuration.
I did look for that,, some are available,, but they look crap :-/
@@MyPlayHouse
What about a similar but dead battery for spare parts ?? 🤔
@@MyPlayHouse
I would try DBA for second hand 36V cycle batteri. Or even post an annonce that you are looking for one. It's worth a chance
I don’t have any experience or advice about the BMS. However, I know you could automate your bench supply operation. Considering that the battery pack is rated 10 Ah, for lithium polymer cells, you could do as much as 10 A charging (that 1C, where C is the capacity). When you start the operation, just set the bench supply Current Limit to anything below the 10 A and voltage to 42 V and it will take care of the rest. Actually, I think your bench supply current capability is less than 10 A. But whatever, you can depend on the resulting constant current charging. Maybe you like better a 0.1C setting, which in this case means 1 A current limit on the bench supply. So, you would let it go at the 1 A current, until eventually the bench supply changes to voltage limiting mode from the current mode at 42 V. Never mind the power reading - fixed 1 A current would produce growing power with the growing battery voltage, until the 42 V, when the current will drop to something near zero. Unless the BMS is already active doing something I don’t know.
Thank You,, I like to do it a bit slower.
Hi, sorry just have to make a correction to a statement you made, there is no over charge from the charger at all. Your battery is a 10S 10S x 4.2V = 42V. The other thing is, the current will be divided by the number of cells in parallel. If as you say there are 4 cells / 2000mA or 2 A = 500mA or 0.500A per cell.... There is absolutely no overcharge or over powering from the charger... Nominal voltage of Li Ion cells is 3.6V full voltage is 4.2V....
Hi @GapRecordingsNamibia
Thank You very much! glad you liked the video :-)
Thank you for watching! :-)
take your tester in position, 20A DC and with the test leads make a short on the less batt and less chargin /motor
having connected your power supply, for 10 minutes or more
I do not follow??
@@MyPlayHouse if you look at a BMS connection diagram, you will see that the negative pole is interrupted with mosfets, both for charging and discharging
with the tips of your tester, on the 20 or 10 A DC scale, connect the two negative wires B- and C- with the 42 volt charger connected
you will see that your battery charges even if it is at 9 volts. after 30 volts, your BMS will start working normally again
the one you have spelled with your power supply, is fine up to 42 volts, but a check of individual cells after a full charge and a two-hour break, you should find them all at around 4, 15 volts depending on the quality of the cells
good anyway
Why can't the battery management system just work and take the batteries from whatever to working?
Cells are fine.
BMS won't reset battery untill battery reaches 42v and remains there normally less than 10min sett PSU for 42v 2amps and just leave it it can't over volt as you are only supplying 42v
worked fine for me.
I did it lazy way I never took battery apart I just used power pins.
Okay,, Thank you,, I will try that,, only got it to about 40V
the charger should work as soon as the batterys reach 30/36v and it will start charging ,if not the bms may of gone to sleep@@MyPlayHouse
Bms is an easy change, but I would just charge thru the ports and just test balancing every 3 charges...
Okay,, I have seen BMS´s for similar systems,, but not the one in here.
Great video
I dreamed of getting this working.
Well its charging now, but it's a picky sod.
I've seen chargers that seem dead and leaving it on charge over night often wakes it up.
I hate the batteries that become impossible to charge for no reason :-(.
I must admit,, I did not try to leave it over night,, not a bad sugestion as such.. nothing to lose. :-)
on some of these bms to wake up/reset is to disconect the b1 and b10 for a minute or two
Hi @ianl4308
Thank You very much! glad you liked the video :-)
Thank you for watching! :-)
Not battery related. It looks like the grips on the handlebar are on the wrong side. If it is a nice relaxed curve on the bottom side, then swap the left to the right and the right to the left. It will be more comfortable on longer rides. Battery related... You need to be cautious of these Chinese batteries. There are no safety protocols for a lot of them. Many people in the US have died because they have gone up in smoke. There are several blocks in the NYC that have burned to the ground because of this. Several bike shops gone. I work in a bike shop in NH and we will not let a customer that brings in one of these off name brand of bikes into the shop leave the battery. They have to take it with them. We will work on the bike and make it work but will not touch the electrical system. We only work on the e-bikes we sell because the companies we rep do take battery safety seriously. A lot of people that buy these Chinese bike will park their bike by the door while changing. If it goes up in flames (and these batteries go up in flames super fast) you most likely wont get out unless you have a second exit. This smoke is very toxic. Good luck getting to the second exit.
The BMS and build quality seamed fine,, and I for sure ran head first in to some safety limitation.
👍
Thanx
Im sure you just need to get the cells to 3.7v minimum each. 18650 cells 3.7 to 4.2v.
I got it to 40v afterwards...
3.0 to 4.2 is working voltage for 18650. Not 3.7 bottom
In the meanwhile it started to rain. 😂
Yes,, that happens,, quite often.
BMS = Bowel Movement System
Buy More Snacks..
I bike
Hi @user-jt5vm3mi1w
Thank You very much! glad you liked the video :-)
Thank you for watching! :-)