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APPENDIX D
88
RECOMMENDED FLOAT AND EQUALIZE VOLTAGES
This table contains suggested values for commonly used batteries. Consult your battery
manufacturer's documentation for specific values and settings for your battery type.
Battery Cell Type
Recommended
Float Voltage/cell
Recommended
Equalize Voltage/cell
Antimony 1.215 Sp. Gr.
2.17 2.33
Antimony 1.250 Sp. Gr.
2.20 2.33
Calcium 1.215 Sp. Gr.
2.25 2.33
Calcium 1.250 Sp. Gr.
2.29 2.33
Lead-Acid Types
Absorbed / Gelled Electrolyte *
(sealed Lead-Acid type)
2.25 *
Nickel Cadmium
1.42 1.47
* Sealed Lead-Acid battery types should not be used in ambient temperatures above
95° F / 35° C, and should not normally be equalized. Please consult your battery
manufacturer's documentation for specific equalizing recommendations.
TEMPERATURE COMPENSATION
If batteries are to see temperature variations during charging, a temperature
compensation option (A10) is recommended. If this option is not part of your charger,
manual adjustments should be made. Please refer to the equation and table below for
temperature-adjusted voltages.
temperature-adjusted voltage = charge voltage x K
Temperature
(°F)
Temperature
(°C)
K
(Lead Acid)
K
(Nickel Cadmium)
35 1.7 1.058 1.044
45 7.2 1.044 1.034
55 12.8 1.031 1.023
65 18.3 1.017 1.013
75 23.9 1.003 1.002
77 25.0 1.000 1.000
85 29.4 0.989 0.992
95 35.0 0.975 0.981
105 40.6 0.961 0.970