How do I temperature compensate my hydrometer readings?

If you are using a non-temperature compensated hydrometer, make the adjustments shown in the table above. For example, at 30˚ F (-1.1˚ C), the specific gravity reading would be 1.245 for a 100% State-of-Charge. At 100˚ F (37.8˚ C), the specific gravity would be 1.273 for 100% State-of- Charge. This is why using a temperature compensated hydrometer is highly recommended and more accurate than other means when testing flooded battery types. For non-sealed batteries, check the specific gravity in each cell with a hydrometer and average the readings.