I don't know about your battery not holding charge well. But, my experience was having a problem with running down the battery after leaving the lights on driving into work early. Eventually having to replace the battery. I figured Id get wise and just put in a battery from the local parts yard. It worked!
Doing a little research, I found First Interstate and Kirkland batteries good if you can find them at the yard. Don't like to be nickel and dimed to death. I also bought a dash solar powered trickle charger, probably a good idea to get some trickle charge going into your battery. My charger has clamps directly to the battery itself.