Crush
Contributor
Replacing a battery might not sound like a big deal, but if something happens to the o-ring, and the transmitter floods. That my friend is called a $400 paper weight, depending on brand.
How to replace a battery on scuba gear:
1. Remove the cap
2. Gently remove the o ring by pinching it together. If this fails try a toothpick
3. Remove all grease and grime from the ring with a lint free cloth or paper towel. Dig any grime out of all surfaces that contact the o ring
4. Inspect the o ring for nicks or cracks. If in doubt replace it
5. Replace battery
6. Squeeze a very small amount of silicon grease onto your finger and work it over the o ring until it has a uniform sheen. There should be no obvious globs of grease.
7. Replace o ring and tighten the device closed hand tight.