Instead of removing the battery I suggest you buy a Battery Tender. It's an intelligent trickle charger that monitors your batteries state of charge and charges it accordingly. For more
info go here:
http://www.4unique.com/battery/deltran/deltran.htm
For best
price go here:
http://www.accwhse.com
I have used the Battery Tender for a few years now on vehicles and my riding tractor, they are absolutely awesome. Hope this helps.