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Virtually nothing uses Nickel Metal Hydride batteries now (except the rechargeable batteries usually sold with cheap chargers in camera shops)... eReaders, mobile phones, cameras, laptops, notebooks etc... all Lithium ion cells... manufacturers say perfectly happy with incremental top-ups, not recommended to fully discharge, if stored and not used then set at around 50% charge before switching off... also when charging, charge lights normally go out at around 80% charge so leave on for full charge and the technology stops charging at full power...
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