Fujitsu 4UR18650F-2-QC-LJ1 Battery. This is a 14.8 Volt 4400.00 mAh, Li-Ion Battery. Dimensions: 10.75 x 2.25 x 0.75. More power! Delivers 27% more power than the original battery. Get 30 days money back and 12 months warranty on Fujitsu 4UR18650F-2-QC-L