sounds like you have a drain for sure.. you might dis connected the battery or take the battery out after your drive, at least for a couple of times,,(after it is charged up) this may save your battery till you can find the problem .. you can ruin a battery if you have a drain.... how well I know that, I went thru 2 on my 52 before I realized the drain, never could find it so I installed a dis-connect switch.