Stuck Screw

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It looks like the Phillips head may be stripped. Try using a regular screwdriver that will fit diagonally. However, if you do manage to get it loose you will have to find another screw to replace it as the same problem could happen again. Those screws aren't always easy to find as they have such fine threads. If you have a junker, parts train that uses a screw to open the battery compartment whether it be for the engine or a tender may work.