QCell AT&T LG Nitro HD P930 3850mAh Extended Battery + FREE Battery Cover! 3850mAh Extended Battery for Nitro HD! Best Li-Ion Battery in Market! 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!