When I wrote about replacing Gizmo’s house battery bank, I was already inclined to try Firefly Oasis AGMs, and my enthusiasm has only grown. It certainly helped to have RC Collins and Nigel Calder testify further in that entry’s comments about how deeply they’ve “abused” these batteries in ways that boaters like me tend to do. I’m excited about gaining significantly more usable, easy-to-replace power capacity, and the Firefly’s smart, colorful exterior design is a nice bonus. But the switch from two conventional 8D AGMs to a four Firefly bank naturally led me to rethink Gizmo’s battery storage, cabling, charging, and monitoring systems. The job isn’t done yet, and maybe discussion of the details with you all will change the design again…