Battery Drained Half in 4 Hours Disconnected!

Pekoe1111

I just drove four hours after completely charging my battery and now it is at 58%. The disconnect switch was engaged and the only thing on the battery is a Bluetooth battery monitor.  I am thinking the battery must be toast because there is no thing connected to it. I did run it down to 2% twice by mistake in the last two weeks. Thoughts?

pthomas745

What year?  What trailer?  What battery?  What fridge?  Were you trying to run a 3 way fridge while driving on battery? 

What does your Victron say?  If this is a lead acid battery setup, what is the "rested" voltage reading?  What is saying to you that the battery is at 58%?