I have a ES cordless drill and it has a Li-Ion battery (model is ES GB118L20).
The original battery charger is missing and there is almost no way for me to get one in my country.
The Battery has 5 Samsung INR18650-20R 3.7v cells connected in series.
The battery pins are BATTERY+, BATTERY- and 4 pins marked BATTERY1, BATTERY2, BATTERY3 and BATTERY4 which are connected between + and - of batteries (probably used for balanced charging). Also there are T, BS and ID pins which I'm not sure of their role.
I tried charging the cells one by one by connecting a TP4056 charger to each battery pin (for example [BATTERY- and BATTERY1] or [BATTERY1 and BATTERY2], but was not successful. It didn't even start charging it.
Can anyone help me how to charge this thing?