I have a NiCd 2000mAh 7.2V battery that drives two motors. If I run the motors for 30 seconds, the voltage reduces from 7.60 to 5V. Once motors are stopped, it takes a minute to come back to 7.50V at most. What's happening? Is there a problem or is this fine?
Guys sorry I forgot to mention one thing, I designed my own charging Circuit and I think there's not enough current output from the charger. Can that be a possible reason ? What happens when you charge a battery with low current ?