The switching is done in the negative of the bottom battery, not for individual ones.Well if you look at the last battery, its connected directly to + of the DC source. So basicly, it can never stop the charging of that battery, the way i see it. What am i seeing wrong ?
Read the numbers off the chips, and download the datasheets for them, they will explain what they do. As far as I'm aware they bypass the current once a cell is charged, not remove it.I am not sure i am following. Would that mean that as soon as 1 battery is over 4.2V, charging will stop for all of them ?
Genuine electronic parts are inexpensive and can be bought locally from a reputable distibutor. The parts work properly.The reason i am buying things from ebay is that i am on a budget.
So where are you going to find inexpensive battery protection boards from a local reputable supplier?, even assuming you can find someone who has them, they will be buying them from the same Chinese source as the EBay sellers.Genuine electronic parts are inexpensive and can be bought locally from a reputable distibutor. The parts work properly.
All of which as nothing whatsoever to do with this thread, as we're not discussing model aircraft. But it explains your weird charging and protection arrangement.The Li-PO batteries in electric radio controlled model airplanes do not have protection boards. They are charged with a multi-wires balanced charger and the electronics in the model limits the maximum discharge current and cuts off the high current motor when the total voltage drops to 3.2V per battery cell but leaves the low current radio receiver and servos operating so the model can be controlled while gliding in for a landing.
Lithium is a highly reactive metal, and burns easily.Like i said, beside BMS, i will add temperature and current fuse. But yes, i understand the problem. I am wondering, overcharge (voltage over 4.2V). Why does the battery explode ? Does it heat up or not during that charge to high voltage, for instance 4.5V.
Because the chargers aren't isolated - the negative 5V input on the USB socket (or the two PCB pads) is connected directly to the negative output to the battery. So if you power them from the same supply you're putting adirect short from the negative of one battery to the negative of the next (with is also the positive of the first one) - BOOMMMM!!!!!.Forget about bms wires, i ordered different bms altogether. Could you tell me why 5V power suply has to be seperated for each board and why cells cannot be in series when i charge them individualy ? It seems there are no simple solutions ..