I know there are a zillion threads on batteries. I've searched.
Is there a relatively simple checklist somewhere on how to fault diagnose house battery problems? I have a digital meter with clamp. I understand basic 12V systems.
My issue is that my 12V house batteries (2ea) drop like a rock when unplugged. They checked good with a hydrometer a few months ago. Today they turned CG power of for 15 min and my inverter was alarming at 11V within 10 minutes. There's water in the batteries. A month ago they lasted for 4 hours before crashing. Nothing was on either time except the usual parasitics.
Thanks in advance
Hickory, NC
2007 Fleetwood Discovery 40X