Using a hydrometer
Squeeze the hydrometer bulb, put the nozzle into the cell and release the bulb. Remove the hydrometer and read the state of charge when the float has settled. Squeeze the bulb to replace the electrolyte.
Squeeze the hydrometer bulb, put the nozzle into the cell and release the bulb. Remove the hydrometer and read the state of charge when the float has settled. Squeeze the bulb to replace the electrolyte.