I lost a charger that has a output voltage of 8.4v Can I use a charger that has output voltage of 9v to charge it or will it not charge properly?? FYI, its to charge a battery pack for a portable LED light system.
Depends on where the charge controller is located. This is the circuitry that adjust the charge rate for the batteries to charge them properly without overcharging, a difficult task that requires circuitry tailored for that battery. If it is in the light, and it probably is, a small change in input voltage is not important, as the charge controller will handle that. But if not, then you have to use an exact replacement.
Probably. It partly depends on the type of battery inside and whether there is regulation in the light or it just allowed the voltage to drift up to 8.4v - if it can drift further, the battery might be damaged.
