How do I fill the water in my batteries?

Do all of this with it disconnected and preferably out of the boat. If you have maintenance free batteries its best just to replace them. They can be topped off but I don't like to do it. If not, then you can use distilled water to bring the level up. Add enough water to cover the cell plus a tad more do not fill it up! It will spill over after charging and cause a mess and possible explosion/fire.
 
Fill all 6 holes and try not to overfill as already stated.
 
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Distilled water from the supermarket and get a turkey baster to fill.
 
Inside each of the 6 holes you will see a 'neck' sticking down, only fill it up to the bottom of this neck. No more, and only use distilled water. I use a small dirinking cup and flashlight and carefully, and slowly pour it in. Wipe up any spillage and throw away the rags or paper towels and they may have some acid on them.

Batteries should be checked often, if you find that you are adding water more than 1 time a month then they are probably near the end of their usefull life. I get 3-5 years out of my deep cycle house batteries because I have an aftermarket smart charger with temp sensor, and I watch the water levels closely. I check them every 2 weeks but can go several months without having to add any water during the first few years.

Good luck.
 
If you want to move from a $1 baster to a $3 high tech tool, specifically designed for the job...your local Harbor Freight probably has a little battery filler contraption...complete with a ball on the end of a nozzle, that allows you to just reach over, fill to the correct level and move to the next cell. You can even save the $3 by borrowing Carter Chapman's.
 
I have an autofill contraption on my boat that I don't need. I'll sell it to you as soon as I figure out what it's worth.
 
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