QCell Sprint HTC Evo 3D 3850mAh X-Life Extended Battery + FREE Battery Cover (NOT compatible with EVO 4G / EVO Design 4G / EVO 4G LTE) HTC Evo 3D 3850mAh Extended Battery! Designed in Canada! Double Your Battery Life with this High Capacity Battery! Comes with Free Battery Cover! DYNAStop overcharge IC stopper built in! Voltage: 3.7V / Premium Quality and Best Material used!