Steve Jobs and Apple have placed an effective separator — a barrier between the anode and the cathode in the battery that lets ions pass but not electrons — that is preventing the common internal leaking that plagues Ni-MH batteries. It’s like placing a 25-micron thick crossing guard in the guts to control the traffic. As a result Jobs can say that Apple’s Ni-MH batteries, combined with the charger, will still be able to hold 80 percent of its charge after a year.

Regular NiMH lose 20-to-50 percent of their charge in a month of non-use.

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