UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 18v Li Ion chargers and going quietly bonkers

24th Oct 2020, 9:41 pm

Most, if not all, BMS chips only check for over and under voltage on each cell, and merrily turn off the output if either are wrong. None I have seen control charging or do cell balance. Cheap chargers that consist of a USB plug and series resistor rely on a cells BMS chip to terminate the charge at about 4.35V (high voltage trip), way too high. Not the best way of doing it. They also trip at a low voltage about 2.8V per cell but allow a low current in to revive the cell(s), sometimes this works.

24th Oct 2020, 9:41 pm	#9
Guest Guest Posts: n/a	Re: 18v Li Ion chargers and going quietly bonkers Most, if not all, BMS chips only check for over and under voltage on each cell, and merrily turn off the output if either are wrong. None I have seen control charging or do cell balance. Cheap chargers that consist of a USB plug and series resistor rely on a cells BMS chip to terminate the charge at about 4.35V (high voltage trip), way too high. Not the best way of doing it. They also trip at a low voltage about 2.8V per cell but allow a low current in to revive the cell(s), sometimes this works.