Sony NP-FM500H InfoLithium Battery

Small and lightweight, The Sony NP-FM500H Rechargeable Lithium-ion Battery
can be charged or discharged at anytime without developing memory
effect. This means that it never loses its ability to hold a full
charge. InfoLithium battery packs have a built-in micro processor that
accurately calculates remaining battery life in minutes, and they also
display remaining battery time on the camera's LCD as well as in the
viewfinder by continuously communicating with the camcorder or digital
camera.

Compatible Cameras Sony: Alpha SLT-A57 Alpha SLT-A65 Alpha SLT-A77 Alpha SLT-A99 Alpha A200 Alpha A300 Alpha A350 Alpha A450 Alpha A500 Alpha A550 > Alpha A560 > Alpha A580 Alpha A700 Alpha A850 Alpha A900