baterie:leadacid

min charging: 2.15V

cyclic charge:

Temperature	charge per cell [V]	charge 12V batt	gassing voltage cell	gassing voltage 12 V
-20 °C *	2.67 to 2.76	16.02 to 16.56	2.97	17.82
-10 °C *	2.61 to 2.70	15.66 to 16.2	2.65	15.9
0 ° C *	2.55 to 2.65	15.3 to 15.9	2.54	15.24
10 °C	2.49 to 2.59	14.94 to 15.54	2.47	14.82
20 °C	2.43 to 2.53	14.58 to 15.18	2.415	14.49
25 °C	2.40 to 2.50	14.40 to 15.00	2.39	14.34
30 °C	2.37 to 2.47	14.22 to 14.82	2.365	14.19
40 °C	2.31 to 2.41	13.86 to 14.46	2.33	13.98
50 °C	2.25 to 2.35	13.5 to 14.10	2.30	13.8

standby use charge

Temperature	charge per cell [V]	charge 12V batt	gassing voltage cell
-30 °C *	2.44	14.6
-20 °C *	2.34 to 2.38	14.04 to 14.28	2.97
-10 °C *	2.32 to 2.37	13.92 to 14.22	2.65
0 °C	2.30 to 2.35	13.8 to 14.1	2.54
10 °C	2.28 to 2.33	13.68 to 13.98	2.47
20 °C	2.26 to 2.31	13.56 to 13.86	2.415
25 °C	2.25 to 2.30	13.5 to 13.8	2.39
30 °C	2.24 to 2.29	13.44 to 13.74	2.365
40 °C	2.22 to 2.27	13.32 to 13.62	2.33
50 °C	2.20 to 2.25	13.2 to 13.5	2.30

* Note that a fully discharged battery freezes solid at about 0°C, a fully charged battery freezes about -72°C

State of Charge	Flooded battery [V]	Gel battery [V]	AGM battery [V]
100%	12.70+ (2.12)	12.85+ (2.14)	12.80+ (2.13)
75%	12.40 (2.07)	12.65 (2.11)	12.60 (2.10)
50%	12.20 (2.03)	12.35 (2.06)	12.30 (2.05)
25%	12.00 (2.00)	12.00 (2.00)	12.00 (2.00)
0%	11.80 (1.97)	11.80 (1.97)	11.80 (1.97)

(AGM Absorbent Glass Mat)

The figures are based on open circuit readings. That is, when the deep cycle battery isn’t under load and hasn’t been under load for a few hours.