HQRP 2200mAh Battery for Dirt Devil EVO/Dirt Devil M678 Ultra High Capacity [Robotic Vacuum Cleaner] plus HQRP coaster HQRP&reg; High Capacity Battery plus HQRP&reg; Coaster; Battery Type: Ni-MH Battery; Capacity: 2200mAh; Volt: 7.2V; High Drain! 15% more charging cycles compared to the standard battery! 46% more capacity and extra power compared to the standard battery! 100 days warranty!