Ya, I looked into the charger. 350 something dollars. It seemed like it said that my charger would work, but I assume the proper charger would be best of course. I was looking on the battery co. web pages. It also said 'in parallel' and didn't mention 'in series' at all, or I missed it. But a battery is a battery, series, parallel, should all work. I do like the idea of (2) 12 volt batteries.