Do NiMH batteries lose any capacity during their useful life?

Yes they do lose some capacity, but it is normally very, very gradual. This is true with all rechargeable batteries, but some cheap brands of NiMH Rechargeable Batteries have a very high rate of loss. Our NiMH rechargeable batteries are designed to have a much longer cycle life than older generation NiMH rechargeable batteries. Normally after 300 - 400 cycles, rechargeable battery capacity will decrease 10 to15%. Keep in mind that this is the amount of charge the Rechargeable Batteries will hold ...

What is the best state to store my Ni-MH rechargeable batteries. Charged or un-charged?

To get the best use and longest life from your batteries, you should always store Ni-MH rechargeable batteries in a fully charged state.It is also recommended that you charge your Ni-MH  rechargeable batteries at least every 30 days or so during storage.This will assure that your batteries are always in top peak condition and do not become incapable of accepting a charge.  Ni-Cd batteries on the other hand should be stored fully discharged. ...

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