Sony's NP-FM50 InfoLithium M Series Battery provides up to 2.5 hours of continuous recording time.
Rechargeable Lithium-ion battery pack for DCR-TRV8 and DCR-TRV10, DSC-S30, DSC-S50, DSC-S70
Built-in microprocessor accurately calculates remaining battery life in minutes
7.2V, 8.5 Wh with no memory effect
Up to 3 hours of recording time