Lee.org

Just leaving this here for the 35 AH AGM lead-acid battery I use for my CPAP.

Charge State
13.5 full charge (2.25 per cell)
12.5 66%
11.5 33%
10.5 flat (1.75 per cell)

2.0 nominal voltage
2.4 full charge
2.25-2.30 float, don’t overfloat AGM!
1.75 flat
200 discharge cycles total
via Battery University

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And here is the charging info for a flooded lead-acid battery
Charger voltage
Bulk 14.4v
Absorb 13.6v
Float 13.2v

Flooded lead-acid battery charge state
12.6-12.7 full
12.1 half
11.6 20%
10.5 flat