Primary Lithium Ion Battery for the Tecra 780 Series Battery Type: Li-Ion (3.6V 1200mAh, 12 cells) Part# PA2445UR Dimensions/Weight: 2.83"W x 1.14"H x 6.61"L -- 1.1 lbs. Battery Life: One battery Full Power mode: 3+ hrs.; Low Power mode: 4 hrs. Battery Life: Two batteries Full Power mode: 6+ hrs.; Low Power mode: 8 hrs. Recharge Time (Main Battery): Notebook alone: 2.5 hrs./3.2 hrs. Docked In Port Replicator: 3.8 - 4.0 hrs./5-12 hrs. Docked In Desk Station: 4-5 hrs./ 6-12 hrs.