I have attached a 4000mah battery on Intex Aqua Fish. There are some issues that I am facing. 1. Reported voltage is not matching the measured one. Right now: reported: 3.84 V measured: 3.96V.
2. 2500mah original battery and 4000mah extra one always some voltage difference.
3. Original one gets charged a lot quicker than 4000mah one. Can i use a charger + - to directly connect 4000mah battery's + - to charge it ?