I picked up a Johnson Controls group 31 AGM a year ago, a friend picked up 3 for his house bank. The 200 minutes reserve capacity is a plus, as is the bulk charge rate of about 40 amps in my setup. A downside is they weigh 71 lbs.
http://www.multivu.com/players/English/7848851-johnson-controls-agm-battery/docs/sell-sheet-1275152047.pdf I got them at Total Battery on sale for $150 each plus tax and core deposit. http://webstore.totalbattery.com/product-p/agm31p-825.htm I doubt they are worth the $422 list price. Costco is now carrying the JCI group 24 for I think around $166. On long distance races it has no problems lasting 24+ hours running instruments, LED running lights, cabin lights, VHF and occasional Autohelm ( legal under Loor SIs ). The previous West Marine group 24 would last about 12 hours. Michael Brown Windburn C&C 30-1
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