If your battery is in not in the maintenance free group, regarding to your driving frequency, check the electrolyte level of your battery in every 3 months. Please note that in case of shortage of the electrolyte, pure water needs to be added. Do not use any other liquid other than pure water.
If your battery is in maintenance free group but you are driving more than 20.000 km/year then again make service control every 3 months.
Necessarily control the tightness of battery clamps and check the oxidation status per pole terminal in each technical service. Do not forget that loose clamps can cause serious problems from melting of the polar head to burning of your battery. If you have oxidisation on the pole heads always wash poles with hot water until the oxidation is resolved. Otherwise, it may create an additional resistance due to oxidation and prevent charging of your battery.
Clean the battery top to eliminate conductive paths created by dried or wet electrolyte and to prevent corrosion.
In each technical service maintenance, check the batteries voltage. Make this check 1 hour after the motor is cooled. In this way, you may see the real voltage level of your battery. If the voltage is < 12,40 - 12,60 V, then charge the battery 3-6 hours with a 1/20 capacity of your battery. Check the batteries voltage 1 hour after the charging is completed. If the batteries voltage is > 12,70 V then you can end up charging.
