A few simple maintenance rules will help you prolong the life of your light.

1. Before you dive, reassemble your light and check that every part of it is debris-free.
2. Insert a set of new batteries or charge your rechargeable ones. 
3. Test the light by turning it on and off to make sure that it is in good working order.
4. After you dive, be sure to rinse your torch in fresh water along with the rest of your equipment.
5. After your torch has dried, lubricate it if needed. Store your light in a cool, dry place out of direct sunlight. Protect it from being damaged or dropped. 
6. If you won’t be using the light for an extended time, store batteries separately.
7. Last but not least, always follow the manufacturer’s instructions for maintaining your dive light. Follow all recommendations and use only approved substances for lubricating o-rings.