How do you Remove a Ford E350 aux battery?

The two bolts on the rear must be loosened (but not removed). The front Bottom bolt must be loosened (but not removed). The front top bolt must be removed completely. At this point be VERY careful because the battery is heavy enough to injure you if it falls. I recommend carefully lifting it with a floor jack if you are not confident of your strength.

You must then simultaneously lift the front of the battery about 1/4" in order to the have the front bolt slide out of its slot as you slide the battery forward. As you do this; the rear two bolts will easily fall out of their slots and the battery will be completely ready to lower for service.

This advice is based on my 2007 Ford E350 Econoline.