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Deep Cycle batteries - down to 8.5V

On a recent trip (coach delivery) our coach batteries drained down to 8.5V while driving and engine running.  Did we damage our deep cycle batteries or are they still recoverable?  We are new at this and just trying to learn all these systems.  Thank you all. 
Julie & Z

Country Coach Life
2006 CC Affinity 45' c-13 525

Re: Deep Cycle batteries - down to 8.5V

Reply #1 –
You can try charging them, but they're probably done or at least damaged.

Re: Deep Cycle batteries - down to 8.5V

Reply #2 –
If the batteries discharged while you were driving you need to check your boost solenoid and its circuit.  The alternator should be charging your batteries.

As stated previously stated if you can charge them back up they probably won't have the capacity the once had.  Also, when traveling turn off all unnecessary items that are connected to the inverter or if possible turn off the inverter.
Pete
 2000 40'  Magna #5892  CAT C-10