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I went with two Optimas with the adapter trays for a great fit. Almost three years now with no issues. I also run a Pulsetech Solagizer. I park my Hmmwv for the winter and that unit helps keep the batteries up to snuff. Mark

Obviously a load test is the only way to properly test a battery but if you have one with noticeably less voltage them you have a battery with issues.

Check the batteries independently of each other for voltage. Should be around 12.6 12.7 for a fully charged battery. After it's been sitting for a bit. (Flooded)