Got a tip for a rechargable battery to use while ice fishing. If you have a 12 volt power tool like a drill ,you have a battery. the battery will power your finder for a long time. My finder has reverse polarity protection so if I wire it up wrong it won't hurt the unit. Just rigg wire up to match you battery and don't forget the fuse. It will work , Used it once last year, last time out. got it ready for this year . and so recharable. toph2o