Assume the following 12V components are powered by the same two, new, Grp 26 batteries, and either there is a bad cell(s) somewhere or the charger stopping charging. My money is on the charger. It lights up and the needle indicates charging.... Have to wait to check.

As the voltage steadily drops, which components would fail in what order, first to last?

VHF
Depth Sounder
Autopilot Drive
Glendinning Synchronizer/Throttle Controls
E120W Plotter
E90W Plotter
Autopilot Display
Fluxgate Compass

Brought Aslan back from the yard today. Stuff started failing 30 mins. from the yard. Fortunately, I know the route. Nevertheless, it was a low tide trip.

So what's your guess?