REPLACES SONY NP-FM500H. LI-ION 7.4V 1800MAH / 13.32 WH. The battery have a charge capacity of 1800 mAh for Sony NP-FM500H, CLM-V55,Alpha DSLR SLT-A57 Camera. So, you can keep your Camera devices up and running for a longer time than with regular alkaline batteries