Guide to Rechargeable Tool Batteries

Nickel Metal Hydride (NiMH) Batteries

Advantages of NiMH Batteries

    Size AA NiMH batteries

    Size AA NiMH batteries.

  • Higher Capacity: NiMH batteries can hold more energy than NiCd.
  • No Heavy Metals: NiMH batteries don’t contain cadmium, mercury, or lead – the three main toxic heavy metals in other types of batteries.
  • Lighter: NiMH are the middleweights of the battery scene, lighter than NiCd but heavier than Li-Ion.
  • Smaller: NiMH batteries are also the middle battery in term of size.
  • Middle Price: NiMH batteries are between NiCd and Li-Ion in price, making them a good middle-of-the-road choice.

Disadvantages of NiMH Batteries

    Three batteries on shelf

    Battery Shelf life is important.

  • Shorter Life: NiMH batteries don’t last as long as their NiCd cousins.
  • Heat Sensitive: NiMH batteries are susceptible to overheating and require special chargers with cooling fans.
  • Cold Sensitive: NiMH batteries don’t like to work in the cold, so they’re not the best choice for winter outdoor use.
  • Highest Discharge: NiMH batteries are notorious for running down over time when stored on the shelf.

You May Also Like:

See All


Please Leave a Comment

We want to hear from you! In addition to posting comments on articles and videos, you can also send your comments and questions to us on our contact page or at (800) 946-4420. While we can't answer them all, we may use your question on our Today's Homeowner radio or TV show, or online at

 characters available

Guide to Rechargeable Tool Batteries