On the left is the starting battery that was cooked do to unregulated solar charging. On the right a pseudo deep cycle destroyed in less than one season by deep cycling, charging with only an automotive type alternator & PSOC use.


The Kirkland (Johnson Controls) "deep cycle" battery (on right) was brand new in May of 2015 (date code) and put into actual service in July. By October the battery was only delivering 28.2 Ah's from its 115Ah factory rating! This battery was in parallel with a sister battery and both tested nearly identically. Let me sum this up......


THESE ARE NOT DEEP CYCLE BATTERIES!!!!!


Long and short I cut both of them open to expose the internal construction......