BOb86ZZ4,
I just checked the specifications on my batteries. Your batteries are probably similar, but you should trust data from the manufacturer before believing this...
These voltage readings are for no load applied for at least 4 hours. The 4 hours part is a bit impractical, so lets at least specify no load.
Fully Charged - 12.8V or more.
75% Charged - 12.5V
50% Charged - 12.2V
25% Charged - 11.9V
Fully Discharged - 11.6V
Like I said, 11V is too low. You are killing your batteries a little bit every time you do that. Better to top them off every day if you can.
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