Providing an extra 1400mAh of power, this spare BLS-1 will not put constraints on how you want to shoot.
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Memory Free! This BLS-1 can be charged at any time without harm, even if it already has a partial charge and can be typically charged over 1000 times.
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A battery loses power in cold weather, and can become too cold to operate the camera. Keeping a spare battery warm in your pocket to maximize battery power and periodically switching the cold battery for the warm one can significantly enhance battery performance.
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Fully compatible with any Olympus camera that uses the BLS-1 including: Evolt E-400 & E-410