Most are alkaline batteries, discarded after a single duty cycle.

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For added convenience, the SL30 is powered by easily available, AA alkaline batteries, assuring end-users that they can find a replaceable power source no matter where they may be.

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That kind of performance is unheard of in today's plug-free chargers, which tend to be powered by conventional alkaline or lithium ion batteries and often can only last for one or two charges before needing replacement or recharging on their own.

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