I know this doesn't fit into your info dialogue at all Mark, but thought I'd throw it into the discussion. I'm using the Odyssey 1200T as my aux bat under the driver seat. Fits nicely with a little insulating to cover the posts from accidental contact and seems to be running all my "accessories" well.
 
http://www.tnrbatteries.com/odysseypc1200t.html
1200 cranking amps 2600 amps short circuit current 78 minute reserve capacity at 25 amp load Excellent battery for trolling motors in flats boats.Length = 7.87" Width = 6.66" Height = 7.50"(With terminals )Weight = 38.2 pounds Terminals = SAE 3/8" brass automotive 2 Year WarrantyDESIGN:Sealed, rugged dry cell design Military grade Resistant to vibration 60% more starting power Deep discharge reserve power2 year storage life 8-12 year design life Can be mounted in any orientation 
I have everything "hooked" to it and another 1200T as a starter/main bat. with the SurePower 1315 in that box. Since I'm adding a Carver heater and have already added the entirely electric Vitrifrigo refrigerator, this seemed a good choice. the main battery box lid will not fit onto that bozx now so I've insulated that in a sloppy way temporarily, to insure it doesn't have contact with metal. The carpet fits over it as stock appearing.
 
Bob Stevens
'87 Syncro Westy 2.2
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