Or just bring one of the battery leads out of the encapsulation and cut it. Just a tiny bit of solder and you hook it back up. With the rest of the device water

Or just bring one of the battery leads out of the encapsulation and cut it. Just a tiny bit of solder and you hook it back up. With the rest of the device waterproofed just one tiny exposed contact should still remain waterproof with thin gauge solid conductor wire. There's no voltage differential so it shouldn't rust moreso than just a regular blob of solder exposed to the elements.