The industry standard battery for this application is a pair of Trojan T-105 golf cart batteries. This will give you 225 A/H of capacity and with proper care will last 5-7 years.

 http://www.trojanbattery.com/Products/RecreationalVehicle.aspx

Is a list of the various RV batteries available. Any of the sealed battery technologies are still somewhat experimental and charging methods are critical. Conventional flooded batteries will provide the longest life under most conditions and the electrolyte can be topped up.

Dennis

----- Original Message -----
From: Michael Elliott <j.michael.elliott@GMAIL.COM>
Date: Thursday, June 22, 2006 11:41 am
Subject: Battery size to fit under bench seat?

> I recently installed a Norcold DC0040 refrigerator while draws more
> current than I expected (see my post, "Norcold Results") and I
> want to
> increase the size of the aux battery. I presently have an Optima
> installed under the driver's seat. It was a mighty job modifying the
> battery to fit with the lid closed, and it might have been damaged
> overthe winter by a cheap Harbor Freight trickle charger, I'll
> test it later.
>
> But I think I want more capacity. I've already removed the heater from
> under the rear bench seat and have plenty of room there. What's a good
> Group size that fits well?
>
> --
> Mike "Rocket J Squirrel" Elliott
>