I have a device that uses li-ion battery and the device is also connected to battery directly. For charging I have used TP4056 IC. Flow is like this, V_charge(5v) -> TP4056 -> Battery & load (No load sharing switching while charging). Now this is not recommaneded but I have to go with this for now.
Charging supply will not be there always. Charging current for TP4056 : 500mA; Load current : 200mA(max).
Considering my load current will not go above programmed current of TP4056, if I countinue with this flow will there be any problem over shorter and longer period(1 year or maybe 2) ?
My main doubt is what will heppen if battery is in deep discharge and than I apply charging voltage ? If voltage is below 2.9v, IC will go in trickle charge mode than current supplied to battery will be minimal. In this case my load current is still 200mA (higher than supplied). Will battery ever come out of trickle charge ? Could it damage some other components ?
My issue is shorting of Vin and Vbat pins of ICTP4056 in some devices. I am not sure whether the issue is because of above mentioned problem or not. if anyone knows what could cause this behevior in IC and how can I replicate the problem, please share.