Lead acid battery
Quote:
Open-circuit (quiescent) at full charge: 12.6 V (2.1V per cell)
Open-circuit at full discharge: 11.7 V
Loaded at full discharge: 10.5 V.
Continuous-preservation (float) charging: 13.4 V for gelled electrolyte; 13.5 V for AGM (absorbed glass mat) and 13.9 V for flooded cells
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Not starting at 11.9 volts is not surprising