Sony 2NP-F970/B Rechargeable Battery
Make sure your camcorder is always ready to shoot with the 2NP-F970/B InfoLITHIUM® rechargeable battery twinpack.
Small and lightweight the 2NP-F970/B battery twinpack consists of two NPF-970/B batteries featuring built-in microprocessors that accurately calculate the remaining power within minutes. The microprocessors continuously communicate with the camcorder to ensure that remaining battery life is displayed on the camcorder LCD as well as in the viewfinder so you'll never miss a shot.
The 2NP-F970/B doesn't have the memory effect found in other batteries, so you can charge it at any time, regardless of how much charge is remaining, and the battery will never lose its ability to hold a charge