Hi!
I have connected bq40z60 to 7.4v battery pack with 2400mAh capacity.
Pack has built-in under voltage and over voltage protections with 4300mV and 2400 mV thresholds for cells.
I used resistor imulator for 2 cells configaration, because I only have 3 wire from pack(+7.4V, gnd, thermistor).
I can discharge and charge this pack.
But, when I discharge it, internal pack protection activates prior to bq40z60 protections and battery pack voltage becomes zero.
So, when I charge it, current is about 10mA and voltage is 0-1mV.
After that chip needs about 12 hours to start charge battery with normal current.
As I see there are 2 ways:
- correct setup undervoltage protection on bq40z60 for my pack.
- make recover process faster.
Could you, please help me to fix it?
I would be glad to know both variants.
Best Regards, Roman