This battery is a replacement for the one included in every Nintendo DS. This rechargeable Li-ion battery has a capacity of 850 mAh for longer lasting power. It offers up to 6 hours of continuous game play for Nintendo DS. Power up with hot deals from Overstock.com! Features include: NTR-003 compatible part number Li-ion chemistry 3.7 volts 850 mAh capacity 100-percent OEM compatible Copyright (C) Muze Inc. 2005. For personal use only. All rights reserved.