I found this useful deep-cycle battery FAQ that included a rough voltage level chart which helps you determine how full your deep-cycle battery is:

State of Charge
12 Volt battery
Volts per Cell

100%
12.7
2.12

90%
12.5
2.08

80%
12.42
2.07

70%
12.32
2.05

60%
12.20
2.03

50%
12.06
2.01

40%
11.9
1.98

30%
11.75
1.96

20%
11.58
1.93

10%

11.31

1.89

0

10.5

1.75

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