Thats how every cheaper BMS works, main pack voltage reaches 4.2 * cell count it cuts off the curent They donāt have any smart cell checking like @JTAG bms has
EDIT: it can also be your power supply aka chargerā¦
EDIT2: Those BMS has standalone cell balancers which donāt know nothing apart if cell voltage is over its threshold (4.2V) it turns on mosfets to dumb the energy (balance)
Not necessarily. Regular BMS work off of resistance. Of the cell beside it. If the difference threshold is to great(which translates to voltage difference) the cell will not be balanced.
So packs with 10 series cells and 9 of them get to 4.20 and the last one is greater than .1v difference(ie is resting at 4.09) likely will not be balanced. This is a safety feature as most healthy packs that have not been over discharged, should naturally hold a very close balance.
If your pack isnāt holding a close balance with less then 0.1v variation. Then something is wrong with your pack.
Balance circuits are pretty simple, and designed not to balance an unhealthy pack. Just the nature of rudimentary bms
it has two things in chinese, near the balance port, top one says 25amp and botom one 8amp
in picture its next to the balance port
(Chinese): 25amp
(CHinese): 8 Aamp
somebody knows what the botom one means and what the top one means?
your says 13(chinese)48v does that mean 13s input voltage 48volt? mine says 8(chinese)24V and i bought 8s but 8s is 33.6 fully and at 3.6v its 29v but input ojn bms is 24v please help me becouse i need to buy a powersupply
Yeah those numbers never made sense to me either. Just buy thecharger you need for a full 8s which is 4.2x8.
When I check their specs it says 54.6 for my 13s for full charge. My guess the number is for lipo cells another type other than lithium ion cells.
Donāt worry, Iām going to use mine as 12s even which is possible.
The way these work is whichever many are in series will be the charge voltage you need.
Nominal charge for lipo is 3.7. That times 8 gives you your 29 and a bit. So these numbers they mention are the nominal charge voltages for lipo.
If you are using lithium ion cells with a nominal charge of 3.6 volts than no you will need a charger that charges to 33.6 volts or they will never fully charge.
Forget what the bms says. Your cells tell you charge me full to 4.2 volts each.