Worst I've ever had is the X-2 Power(something) AGM... Over $300 bux... First one wouldn't hold a charge. Exchanged free for battery #2.. #2 also wouldn't hold a charge within the first year.. Took it back - and was told 'we'll replace this one, but if it comes back again with less than 10V, we won't honor the warranty... Checked it two weeks ago (WITH a tender on it) and the voltage was 5.6V..
I just dropped that POS off last week at the local auto parts store for a standard maintenance-free series 31 (for $114) and hope I won't have to mess with this crap again...
Best of luck with your issues sir...
