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A lead acid battery at 11.7 is 80% discharged, getting down below 50% discharged shortens the battery life a great deal.
100% 12.7v
90% 12.6v
80% 12.5v
70% 12.3v
60% 12.2v
50% 12.1v
40% 12.0v
30% 11.8v
20% 11.7v
10% 11.6v
00% less then 11.6 volts, if you let them get this far down more then a few times then it's a good idea to start shopping for a new battery.
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