Powered Up and Ready to Go - High Capacity NiMH Rechargeable Batteries - Charged and ready to use out of the package - Maintains 75% charge for up to 1 year when not in use - Rechargeable 500 times - Save over $364 per battery over regular Alkaline - No Memory Effect - Can be used in Extreme low temperatures down to -4F - AAA 950mAh Typical 900mAh Minimum