Batteries will continue to discharge even if they are just sitting in your equipment. If they are rechargeable they have a definite life-cycle. Regular batteries also will only hold their charge for a certain amount of time. It's better to change them out if they don't seem to be working correctly in you camera.
Yes it is! the manufacture suggest taking the battery out if the camera sits idle for weeks and months, that way you can have the full use of the battery.
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