Panasonic VW-VBJ10 (VW-VBJ10PP1K) Rechargeable Lithium-Ion 940 mAh Battery Pack for Compatible Panasonic Camcorders Rechargeable Lithium-ion Battery Pack Designed for optimum performance for these Panasonic camcorders: SDR-SW20, SDR-S10P1, SDR-S7 Actual recordable time is 40 minutes Continuous recording time 1 hour 10 minutes 3.6 V 940mAh