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Tech Tip: Use NiMH Batteries for Remotes

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LaCrosse BC-700 Charger and Rayovac NiMH Batteries

Recently, I started to replace our AA alkaline batteries with NiMH (Nickel-Metal Hydride) rechargeable batteries.  My main reasoning for the switch was the many remotes that use AA or AAA batteries (2 XBox Controllers, TV Remote, 2 DVD Remotes, and Stereo Remote) in the house.

After investigating NiMH technology, I found the following advantages:

  • Rechargeable – Less batteries to buy, means less waste for those green folks out there.
  • Low/No Memory Effect – This was more of a problem with certain NiCd (Nickel Cadmium) batteries, but it basically means that you don’t need to worrying about charging the battery when it’s only partially discharged.
  • Low Self-Discharge on Certain Batteries – These have better shelf life than standard NiMH batteries.  Manufacturers claim that these batteries will keep 70-85% of their charge after one year. Look for batteries that are labeled as pre-charged or hybrid.

If you are looking to move to NiMH batteries, keep these points in mind:

  • If you want to keep spares available for a long period of time, look for low self-discharge NiMH batteries.  Again, these will be labeled as pre-charged or hybrid.
  • NiMH batteries come with different capacities, measured in mAh (milliampere-hour). Shy away from batteries that claim a very high capacity (over 2100 mAh), as it appears that they have a higher self-discharge rate than lower capacity batteries.
  • Smart chargers are better than dumb chargers.  This mainly due to the fact that dumb chargers will not give you any indication on when a battery is charged.  There are varying degrees of smart chargers, but the main point that I’d look for is an indication that a battery is charged.
  • Avoid quick chargers, especially chargers that claim a 15 minute charge time.  Charging batteries at a higher mA (milliampere) level can degrade the battery cell.  The charger I use has charge levels of 200 mA, 500 mA, and 700 mA.  I use the 200 mA level unless I need a faster charge.

With these points in mind, I recommend the following batteries and chargers:

If you do not wish to buy from these Amazon links (I do participate in their affiliate program), most of these components can be found at Best Buy, Wal-Mart, or other online stores.