Controller Battery 2-Pack for Wii 2 rechargeable Lithium-ion Polymer batteries removes the need for replacement batteries New advanced technology Lithium-ion Polymer batteries last longer than NiMH batteries, which continually drain power even when not in use Maintain up to 8 hours of continuous game play on a single charge Batteries are easily recharged by your Wii console USB port (mini USB cable included) Your Remotes for Wii will always be ready for your next game 2 rechargeable Lithium-ion Polymer batteries removes the need for replacement batteries New advanced technology Lithium-ion Polymer batteries last longer than NiMH batteries, which continually drain power even when not in use Maintain up to 8 hours of continuous game play on a single charge Batteries are easily recharged by your Wii console USB port (mini USB cable included) Your Remotes for Wii will always be ready for your next game