S&C Instruction Sheet 768-550 21
Maintenance
Periodic Battery and Battery Charger
Inspection
An annual inspection of the battery system is recommended
to ensure reliable performance.
The annual inspection of factors such as the battery’s
physical appearance and the charging voltage can play an
important part in determining whether the batteries are at
or nearing the end of life.
Equipment required
• A dc voltmeter (3½ digit)
• Battery ID labels that are user furnished and show the
date of battery manufacture and a unique battery identi-
fication number
• A thermometer
Initial preparation
Good record-keeping is important for obtaining optimal
results at the lowest cost. The objective is to establish a base
line for the measured values and watch for trend changes.
Record the following:
• Battery identification number
• Date of installation
• Battery charging voltage
• Ambient temperature
• Date removed from service
• Battery appearance
Physical appearance
Examine the battery for signs of corrosion, particularly at
the battery terminals. On some battery installations it may
be necessary to slide back the retaining device, such as the
plate or strap, to see the termination points.
Replace every battery that shows signs of terminal corro-
sion, even if other measurements are okay. Corrosion usually
appears as white powder at or near the terminal posts. It may
be necessary to replace the associated corroded “Faston”
connectors. Corrosion indicates the battery case has been
breached. Normally, a positive pressure exists in the bat tery.
When the battery case is breached, elec trolyte can ooze out
and air will enter. The introduction of air significantly affects
battery chemistry and rapidly results in battery end of life.
