HH56 wrote:
If you do wind up needing a battery, one thing I have become a firm believer in is a battery tender. The one I have is by Schumacher, has a trickle output and turns itself on and off as needed to keep the battery topped off. I mounted mine permanently to the tray but like all my other "mods" is easily removed with a couple of screws.

Several brands are available for 6 or 12 volt batteries. Many come with the typical clips for the post for temp use or the terminals for permanent mount.