How to Charge NiMH Rechargeable Batteries

Written by sarah coennen
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How to Charge NiMH Rechargeable Batteries
(Battery Charger image by Edward Stephens from

NiMH rechargeable batteries are made out of nickel and metal-hydride. NiMH are one type of rechargeable battery, and they are available in AAA, AA, C, D and 9-volt sizes. You can buy chargers that will recharge these batteries. Some chargers will only fit size C and D or AA and AAA while some are built specifically for 9-volt batteries. It is important to have a charger specified for your type of batteries to avoid causing the batteries to malfunction. Purchase NiMH batteries and chargers online or wherever electronics are sold.

Skill level:


  1. 1

    Place the batteries into the charger with the polarities on the correct sides of the charger.

  2. 2

    Unfold the outlet plug in the back of the charger if necessary.

  3. 3

    Plug the charger into the outlet. This outlet can be in a wall, power strip or extension cord.

  4. 4

    Verify that a red light is showing on the charger. The light indicates that the batteries are in the charger correctly and that they are charging.

  5. 5

    Remove the batteries when the red light turns green. Use and recharge as needed.

Tips and warnings

  • Do not try to charge two different types of batteries, such as NiMH and NiCd, in the same charger. Doing this will damage the batteries and they may never hold a charge again.

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