I met a guy at Deland who was kind enough to let me borrow his battery/inverter pack for some field repairs (using an AC Dremel). He said he got it at Sam's for about $70. This device was very slick- had a bunch of features, outlets, and connectors. Most of all, it had great power and endurance.

Unfortunately, I can't remember the brand name, but if you look in Sam's club or a larger Walmart, you might find something like this that'll fit your needs.

- George