Checking the state of charge of the battery

If during operation there are difficulties with starting the engine, check the degree of charge of the battery by electrolyte density or voltage at its terminals in an unloaded state (tab. 10.4). Use a hydrometer or a commercially available electrolyte density float indicator to check the electrolyte density. The voltage at the battery terminals can be measured with any DC voltmeter with a measurement limit of 20 V.

If the battery state of charge is 75% or lower, the battery must be removed from the vehicle and charged using a charger.

Table 10.4. Parameters for checking the state of charge of the battery

Output voltage, V	12,65	12,45	12,24	12,06	11,80
Electrolyte density, g/cm3	1,27	1,23	1,20	1,17	1,12
Degree of charge, %	100	75	50	25	0