From Google Maps
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If you continue further past the third battery, you will come to a dead-end cemetery. Park your vehicle there, and from where your motorcycle is, proceed about 200 meters to the left and forward, and you will find the battery.
Ignore the cemetery and continue until you reach the dead end. There is a path on the left, so follow that. Unlike the other battery ruins, this one seems to be well maintained and there is less undergrowth, making it easy to reach.
From the dead end on the map, there is a forest that people can pass through to the east. If you go along the path for about 100 meters, you will find the remains of a gun battery.