DIY battery box

This guy has a nice tutorial on building a battery box:
http://palmettokayakfishing.blogspot.com/2011/09/kayak-battery-box-for-2012-ride-135.html

I followed his approach, with one notable exception. Instead of using a large rubber stopper (which requires a large hole in the box), I drilled a couple of 1/8" holes, and inserted small rubber grommets into each. The wires fit thru, but it's pretty snug. I also tied a knot on each side to keep it from sliding, and for extra insurance, I'll smear a little silicone on it (haven't got around to that yet).

It took some effort to get the grommets in those small holes, but other than that, it's a piece of cake, and should be truly waterproof.

This guy has a nice tutorial on building a battery box:
http://palmettokayakfishing.blogspot.com/2011/09/kayak-battery-box-for-2012-ride-135.html
 and should be truly waterproof.

It is. Ive used that exact set up on my trident for a few years. I suspend it from the old rod pod bucket by carving slits in the bucket. Bomb proof. Nice work.

After building at least 4 different battery boxes for different kayaks I've owned over the years, the last two I didn't bother with. The battery is sealed, if you use good marine connectors and heat shrink a battey box  becomes obsolete in my opinion. My current battery set up is a homie deep gear bucket in the rear hatch of my revo. Before that they were just set inside of the red bag that Malibu uses on there hatches. Never had any problems. Lots of dielectric grease and only connect the battery when your using it.
Hobie doesn't use any waterproof housing on there livewell battery. Just good weatherpac connectors.