Checking the battery (Mazda 121 (3))

Checking the electrolyte level

The electrolyte level in individual cans should be between the "MIN" (1) and "MAX" (2) marks. If necessary, unscrew the plugs (3) and add distilled water.

Checking voltage

The condition of the battery is checked by measuring the voltage between the battery terminals using a voltmeter.

Clean the outside of the battery.

To check, the battery should not be charged for at least 6 hours, including with the engine running. Otherwise, turn on the headlights for 30 seconds before charging.

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Turn off the headlights and all other current consumers and wait 5 minutes.



Connect a voltmeter to the battery terminals and measure the voltage.



Evaluation of measurement results:

12.7V or higher	The battery is in good condition
12.6 V	The battery is normal
12.4V or below	The battery is in bad condition, charge or replace it

Checking the battery under load

Connect the voltmeter to the battery terminals.

Start the engine and measure the voltage.

When starting the engine with a fully charged battery, the voltage should not drop below 10 V (at a temperature of +20°C).

If the voltage drops sharply and the electrolyte density in the battery banks is different, this indicates a malfunction.

Checking the density of the electrolyte

The density of the electrolyte in combination with the voltage gives an accurate conclusion about the state of charge of the battery. Remove the caps from the cans. A density meter (hydrometer) is required for checking. The density of the electrolyte is measured in g/ml (g/cm³) or in degrees Baume (+°Be'). The following values should be obtained:

State of charge	+°Ve'	g/ml
Discharged	16	1,15
Half discharged	24	1,22
Well charged	30	-1,26

Check all the battery jars one by one - they should have the same density of electrolyte (permissible difference - 0.04 g/ml). If this is not the case, the battery is faulty.