Guide to Rechargeable Tool Batteries

By: Julie Day

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.

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