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Does the hatch refuse to close, despite the battery still fitting into the battery compartment? or is it some other problem, such as the hatch closing but no staying closed i.e. not latching when closed ?
If the camera is fairly old, this may simply be sheer plastic (or metal parts) fatigue, and the camera may just have to be fixed. Or replaced. Or have the hatch held shut by one or two postal rubber bands (the thick broad kind.)
How old is the camera? in months or years since you bought it.
Has the camera been dropped or otherwise subjected to mechanical shock(s) in its lifetime?
Has the camera been operated in or subjected to, temperatures below 32 degrees F (freezing point) or above about 100 degrees F ?
Has it ever been subjected to a humidity higher than 85 % or gotten wet ?
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