I built a pump/water proof batery box set up like 8 years ago that finally bit the dust. I needed a cheap replacement quick so went to home depo and bought a 36" hand piston pump. I thought I'd use it only until I got my electric system rebuilt but it was so simple and worked so well I just kept using it. At 4 strokes to the gallon just a few strokes every few minutes keeps the bait fine. Not sugesting every one go to this low tech but as a back up for when you forget to put your battery on the charger or go to baja when you can't charge a battery it is an option. You should have a hand pump on you yak any way. Mike
http://www.homedepot.com/webapp/wcs/...7592%2d%5f%2dx