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Hahnel introduces a line of independent alternative batteries for use with different cameras. It is important to provide yourself a backup to power up your cam wherever you go. The Hahnel Olympus HL-40B/42B is made as a replacement battery for Olympus Li-40B/42B. The light and compact battery features 720 mAh Capacity, 3.7 Voltage Output, and 2.7 Watt Hour Power for use with select Olympus cameras.