Product Features:

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 - […]

Product Features:

Rechargeable lithium-ion battery pack - up to 20 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 […]

CTA Digital WI-BBP Battery Pack for Wii Balance Board. Put one side of the USB rotate cable of DC into Balance Board battery pack connection. Connect the other end of the USB into the Wii controller USB expansion port. Insert the full powered battery pack into the Balance Board battery compartment.
View Wii Fit Rechargeable […]

Features of Wii Charge Station with 2 Battery Pack:

Charge status glow strip indicates when the pack is being charged
Powered via USB connector, directly from a Nintendo Wii game console
Completely charges battery in just over 1 hour
Includes two batteries - One for use in the Wii Remote, another charging&waiting for use

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Features of Nintendo DS Lite Replacement Battery:

Extra battery gives up to 3 hours of game time
Custom battery door screwdriver included

View DS Lite Replacement Battery details at Amazon