Small and lightweight, Sony's Lithium-ion batteries can be charged or discharged at anytime without developing memory effect. This means they never lose their ability to hold a full charge. They also display remaining battery time on the LCD as well as in the viewfinder by continuously communicating with the camcorder. InfoLithium battery packs have a built-in micro processor that accurately calculates remaining battery life in minutes.
InfoLithium 'M' type Rechargeable battery with Super Quick Charge capability.
NP-QM71D: 7.2v, 19.9WH (2360mAh).
Built-in Microprocessor accurately calculates remaining battery life in minutes
Super Quick Charge takes 70% less time to charge the battery.