Answer :
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 not the quality. See the chart below.

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