Manual

745-680-B9-001
12
5.0 Charging, continued
6.0 Maintenance
The SMU battery is maintenance free only in regards to the electrolyte. For assurance of reliability it
is important to perform the recommended periodic maintenance.
To avoid damage to the equipment or injury to the technician, follow these precautions:
• All maintenance work should be performed by a trained technician.
• Remove all jewelry.
• Do not smoke or use fi re near batteries.
• Use insulted tools when installing or maintaining the batteries. Do not lay metal tools on the
batteries.
• Do not remove the safety valves from the batteries or add anything to the batteries.
• Do not clean the batteries with organic cleaners.
• Do not use defective or damaged batteries.
WARNING!
6.1 Monthly Maintenance
• Make sure the battery room is clean.
• Measure and record the ambient temperature of the battery room.
• Make sure the batteries are clean.
• Check for damage, or evidence of over-heating on the terminals, containers, and lids.
• Measure and record the total voltage and fl oating current of the battery system.
The conditions under which the battery needs to be boost charged beyond its fl oat charging
are:
The cell fl oating charge voltage is less than 2.18V.
The battery has been in a unused state for more than 3 months.
The battery has been running in a state of fl oating charge for over one year.
The preferred boost charging method is:
• Charge the battery with a current less than .25 C
10
A (0.1 C
10
A to 0.2 C
10
A is
recommended) at a charge voltage of 2.30 to 2.35 Vpc.
• The charge is fi nished when the current drops to less than 0.006 C
10
A.
•
•
•
NOTE:
• In general a boost charge should not take more than three hours. If it does, either the batteries or the
charger are likely defective.
• Take and record measurements before and after charging and during discharge to help track changes
and problems. Wait two hours after charging before you take fi nal measurements so the electrolyte can
cool suffi ciently.
5.2 Boost Charging