Typical Flooded Charge and Float Voltages at Various Temperature Ranges

Temp. ˚F	Charge	Float	Temp. ˚C
Temp. ˚F	Standard	Maximum	Temp. ˚C	Standard	Maximum
> 120	14.10	14.40	12.80	13.00	> 49
110-120	14.20	14.50	12.90	13.20	44-48
100-109	14.25	14.55	13.00	13.30	38-43
90-99	14.30	14.60	13.10	13.40	32-37
80-89	14.40	14.70	13.20	13.50	27-31
70-79	14.42	14.75	13.40	13.55	21-26
60-69	14.45	14.80	13.55	13.85	16-20
50-59	14.48	14.80	13.70	14.00	10-15
40-49	14.50	14.80	13.90	14.20	5-9
< 39	14.55	14.85	14.20	14.50	< 4

Equalization voltage for flooded batteries should be maintained at a maximum of 15.60 volts at 80˚F. Make sure to correct the charging voltage to compensate for temperatures above and below 80˚F. Add .028 volt per cell for every 10 degrees below 80˚F and subtract .028 volt per cell for every 10 degrees above 80˚F.