This sony npfm500h m series battery is designed to provide high stamina battery life for the sony alpha a100 a200 a350 a500 a550 a580 a700 digital slr cameras and a65 a57 a77 a99 digital slt cameras the battery capacity is 1650 mah 72 v and has compact dimensions at 382 x 205 x 556 mm the battery uses a lithium ion cell thus it can be re charged without memory effect loss of performance