Opteka 1000mAh 3.6v Rechargeable Digital Camera Battery Equivalent to Olympus LI-42B LI-40B Memory free for maximum performance, extended shots - Up to 25% more Ultra high power, True 1000mAh Lithium Ion 3.6v Built-in dual safety fuse Top graded and matched cells used exclusively Brand New, State-of-the-art components, 2 Year performance warranty