How do you Attach your battery boxs in your kayak?

[Dean Machine]

I don't even use a battery box. I have a battery with velcro glued to the bottom and velcro on the inside of my yak. I just hook it up and plop the battery in. It doesn't move. Even when launching through surf. I have done this for about five years with the same battery. I rinse after every use. Admittedly caution must be used whenever metal objects long enough to short the terminals are around. No problems yet.

I thought I needed a box when I was first getting into the sport but found that was not true. I remember a post about using modified tupperware for a battery box. Sounds like an effective, cheap and simple idea.