1. Electrolyte density measurement: remove the battery plugs.
2. Use a hydrometer to collect such an amount of electrolyte that the measuring element floats freely in it.
3. Evaluate the obtained electrolyte density value. If they are: 1.28 kg/cm3 - the battery is fully charged; 1.20 kg/cm3 - half charged 1.12 kg/cm3 - discharged.
4. Voltage measurement: if the battery was last charged no later than 6 hours ago, turn on the low beam for 30 seconds to remove the voltage peak.
5. After waiting 4-5 minutes, measure the battery voltage.
6. Use a voltmeter or tester with an accuracy of 0.02V.
7. All consumers must be turned off.
8. Battery voltage gives an accurate indication of its condition. It can be: 12.4 V - bad; 12.6 V - normal; 12.7 V and above is good.
A hydrometer measures the density of the electrolyte in each individual battery cell. Holding the hydrometer vertically, take in enough water so that the float floats freely. On a normally functioning battery, the measurement results in individual cells will be almost equal. You can see the meaning of the measurement results in the text.
On all Renault 19 modifications, to remove the battery from the stand, you must first disconnect the negative and then the positive cables. Then just unscrew the nut securing the battery (shown by arrow).