i use agroup 27 behind the drivers seat.  does require a modification to
the drivers seat base though; (also two smaller group 24  under the
cabinet.)  about 52US on the 27 and about 44US on the 24 size

jimt

> good advice below, Jim.  And thanks to all who replied.  I did find a
> nearby wally mart with the $40 group 41 with 2yr replacement
> warranty.  What I've been using for the past few years is a $15 lawn
> tractor battery.  So next step up may be this $40 point.  but how much is
> a
> real deep cycle that will fit under the driver's seat?  The Optima is
> $125?
> Edward
>