Nickel Metal Hydride batteries (abbreviated to NiMH) are rechargeable batteries used to power cameras and other similar devices. RC enthusiasts use them in battery packs to power their model cars. A single-cell NiMH battery produces 1.2 volts and has an endurance of 550 milliamp hours (mAh), so a 7.2-volt NiMH pack with an endurance of 3,300 mAh consists of six cells. Charging a 7.2-volt NiMH battery is a simple task so long as you ensure that you set your charger up correctly.
Set the NiMH charger to 7.2 volts. Don't attempt to exceed this, as you will damage your battery and, more importantly, it could be dangerous.
Insert the jack connector from the charger into your NiMH battery. Plug in the charger to the main power supply, then check the charge rate again and make sure your battery is being charged.
Check your charger regularly. Some chargers turn off automatically once the battery reaches full power; others you need to turn off yourself. Leave it on charge for a few hours, if it doesn't have an automatic turn-off. If your battery was nearly out of power, it may take a little longer.
Turn off the charger. Remove the jack that connects your charger to the battery. Your NiMH battery is charged.