Coach battery reads charged but is dead
I left my motorhome for 5 days in a parking lot. I chose not to shut down the coach batteries because it also turned off my fridge, even though it runs on propane. When I came back, the control panel said that the coach batteries were at full charge. But the fridge is completely defrosted and the water pump doesn't work, so clearly it's dead. I have run the generator for 30 mins to try to recharge them and then drove for another 30 mins but it's still dead. Are they dead for good? Is there a way to recharge them? Any advice?
This is a 2003 Chinook motorhome