by Nawaz Qureshi, Vice President of Engineering, US Battery Mfg Co
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Voltage vs SOC for USBMC Golf Car Batteries by Nawaz Qureshi, Vice President of Engineering, US Battery Mfg Co |
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Open circuit voltage is not the same thing as the float voltage listed on our
web site.
Float voltage is a charging voltage at which the battery is connected to a charger during a very long
period of inactivity (months), and will still stay charged and ready to serve. Voltage is not an accurate indicator of state of charge (SOC). However, the table below describes SOC estimates for a 6 volt battery after several hours of standing off charge and unused.
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| Open Circuit Voltage | Electrolyte Specific Gravity @ 80°F | State of Charge |
| ≥6.3 | ≥1.265 | 100% |
| 6.2 - 6.3 | 1.225 | 75% - 100% |
| 6.1 - 6.2 | 1.190 | 50% - 75% |
| 6.0 - 6.1 | 1.155 | 25% - 50% |
| 5.85 - 6.0 | 1.120 | 0% - 25% |
| <5.85 | <1120 | 0% |