While on a camping trip, my tow vehicle battery dropped to 11.6v.
At the campsite, I charged it with my carry along charger, and it appeared to charge.
The battery dropped again the next day, and I made it to Autozone.
Since it was under warranty, and at 11.6v, they replaced the battery quickly.
Well, the battery voltage again was dropping the next day. I made it to a repair garage
that could work me into their day's schedule for a new alternator.
The bill was on the high side, but not out of bounds for the given service.
The warranty is great, although I would need to drive about 500 miles for them to do
any follow-up repairs.
So, my lesson learned is that 11.6v is a done deal.
Good luck!