Do I need to do anything special when installing batteries on or near water?
Installing batteries in marine applications (especially salt water) requires some special attention. The cable used needs to be marine approved and should be tinned copper. If you use any other type of cable be prepared to spray and coat the cable and connections with silicone. Use silicone lined heat shrink tubing to cover terminal connections. The main concern is obviously keeping the marine atmosphere away from any exposed terminals or connections.
CAUTION/DANGER:
Lead-acid batteries contain a sulfuric acid electrolyte, which can be poisonous and is highly corrosive. Flooded Lead Acid batteries will produce gasses when discharging and re-charging which can explode!
When working with batteries, you need to have plenty of ventilation, remove your jewelry, wear protective eyewear (safety glasses) and clothing, and exercise caution.
Do not allow battery electrolyte to mix with salt water. Even small quantities of this combination will produce Chlorine gas that can KILL you!