4 in 1 integrated design: a charger, a USB cable, a battery case/cover/holder and a 3.6V 840mAh polymer lithium rechargeable battery. Use the power adapter to charge for original NDSi battery. Built-in a 3.6V 840mAh polymer lithium rechargeable battery. Use the USB cable to charge for the battery or your NDSi freely and conveniently. Come with a battery case for good protection for the battery.
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