just a friendly FYI of a decent deepcycle/starting battery i found while prepping my Riviera for the season.

Westmarine or in my region Boats US. 

http://www.westmarine.com/webapp/wcs/stores/servlet/product/10001/-1/10001/30755/10001/677/207/9

starting/deep cycle batteries, normally $78 us.  now $49us. only available thru retail stores, no mail/online orders.

it's a tall group 24 battery, well same height as the grp 27 but narrower. 

good for 200 drained dead cycles, and 120mins @ 25amps. 

1 year store 3 year mfg warrenty.. probably not as convient as mallwart warrenty, but likely a muchh better battery
at a decent price.