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Rechargeable lithium-ion battery pack - up to 30 hours of play time per charge.Unique AC port relocator allows easy charging of the battery pack. Play and charge simultaneously.Detachable AC cord for wire-free play. Plugs into any wall outlet - faster charge than USB.Battery pack conveniently charges while inside the Balance Board - no need to remove it once it is installedConvenient LED charge / battery indicator Product DescriptionKeep your workout going strong with the energy of the Pak? s? from Nyko for the balance board Wii... http://www.wii-games.asia/nintendo-wii...