Deka has a great line of AGM batteries in many sizes,
here is a link to them
East Penn Manufacturing | Recreational vehicle batteries
Less costly than Lifelines, however, there is no question that
Lifelines are the very best. I'd guess that Lifelines are the
ten year batteries, and the Deka Intimidators are 5-7 year
AGM's are better in every way, zero corrosion in the compartment,
and no maintenance plus many other advantages.