How do I temperature compensate my hydrometer readings?

If you are using a non-temperature compensated hydrometer, make the adjustments in the table below. 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 a 100% State-of-Charge. This is why 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.

Table 2 - Hydrometer Temperature Compensation