BATTERY CHARGER USER’S MANUAL                                                                                   PART- 2: THEORY OF OPERATION 
 
MCEnPC23-REV.2.4      Page 85 
 
11. REGULAR PREVENTIVE MAINTENANCE 
 
Regular maintenance is required to ensure reliable operation of your system. 
 
 Action  Frequency 
B  Measure and record voltage across each battery 
cell and across the entire battery  
monthly 
B  Verify and record the level of electrolyte in 
each battery cell. If necessary top off with 
distilled water.                          
monthly 
B  Verify and record the specific gravity of each 
battery cell 
monthly 
C  Verify the operation of all indicators  monthly 
B, C  VERY CAREFULLY (especially if you are 
dealing with the conductive substances)
 
remove the accumulated dust around the 
ventilation openings, charger interior, surfaces 
of circuit boards & electrical 
connectors/terminals. 
 
 
 
As needed, depending on the environmental 
conditions of the site, but minimum once a 
year  
 
B, C  Visually verify the condition of all components    yearly 
B, C  Verify all bolted connections. If necessary, use 
a torque wrench to retighten to manufacturers 
specifications 
 
yearly 
B  Clean and grease all battery connections  As needed, depending on the environmental 
conditions of the site, but minimum once a 
year 
B  Wash the battery cells using distilled water 
only 
As needed, depending on the environmental 
conditions of the site, but minimum once a 
year 
 
B = battery   C = charger 
 
For systems supplied with lead acid batteries, a partial discharge of the battery is recommended on an annual basis, 
to verify the battery and charger performances. For systems supplied with nickel-cadmium batteries a complete 
discharge and decommissioning charge is recommended on a bi-annual basis.