Use a hydrometer and thermometer to monitor the density and temperature of the electrolyte.
The nominal value of density is 1.220-1.290 (at 20°C).
Note: The density of the electrolyte depends on the temperature. Therefore, to convert the measured density value to a temperature different from 20°C, it is necessary to use the following formula:
D20 = (t - 20) x 0.0007 + Dt D20, where
D20 - density reduced to 20°C;
Dt - actually measured density;
t - actually measured temperature.

[The original can be found on the website MitsubishiMan]
Note: When performing work, observe the necessary safety precautions. Do not disconnect the battery terminals when the engine is running. When disconnecting the battery, turn off all power consumers and turn the ignition key to the "ACC" or "LOCK" position.
First of all, disconnect the "-" terminal.
