coach batteries

We use the cheaper (vs. other AGMs) Optima AGM, but a decent review recommends the Trojan T-105 where cost is a factor, but the Lifelne AGM if your wallet can afford it - supposedly in the long run (lifecycle costs, affects on charging equipment, etc.) it's the better option due to the differences between flooded and AGM technologies.

http://www.pureenergysystems.com/PESWiki/Directory/Bedini_SG/files/Vonwentzel-battery.pdf