During exploitation should be checked the electrolyte level at least once a year for TORNADO, CYCLON CALCIU , once in 9 months for PILOT, once in 3 months for TERRA, once in 3 months for MAGMA. Electrolyte level should be 26 ± 2 mm over the plates for all types of batteries. A lower electrolyte level could be adjusted only by adding distilled water, never sulphuric acid or top water.
The state of charge indicator on the top of the battery shows battery state of charge and electrolyte level, as following:
-Green: good level, charged battery
-Black: good level, discharged battery
-White: low level, requires distilled water