Just for yucks, here's the table figures for 12-volt batteries. The Tech says they will not replace one unless it is down to 10.5 volts after 55 minutes.
I have not found any other deep cycle battery table that says a 12-volt battery reading less than 12-volts when fully charged is any good at all.
Anyone else?
TABLE 1. State of charge as related to specific gravity and open circuit voltage
Percentage of Charge
100
12.73
90
12.62
80
12.5
70
12.37
60
12.24
50
12.1
40
11.96
30
11.81
20
11.66
10
11.51
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