What is the recommended timing for checking specific gravity after adding water to a battery?

The recommended timing for checking specific gravity after adding water to a battery is after one day or vehicle operation. This is important for several reasons. First, allowing time for the water to mix with the electrolyte ensures a more accurate reading of the specific gravity. If the measurement is taken immediately after adding water, the specific gravity could appear higher due to the presence of undiluted water, leading to an inaccurate assessment of the battery's condition.

Additionally, if the battery is operated or allowed to sit for a while, the electrolyte can stabilize, allowing for a true reflection of the battery's state of charge. Checking specific gravity at this later time helps ensure that the battery has adequate cell mixing and that the readings will better represent the actual performance and health of the battery.

Timing the check appropriately improves the reliability of the diagnosis concerning the battery's state of charge, which is key for maintenance and determining if further action is necessary. Therefore, waiting until after one day or operation provides a more accurate assessment, aligning with best practices for battery maintenance.