All IBM LCD Uninterruptible Power Supply (UPS) units are equipped with the Advanced Battery Management (ABM) function. This feature is permanently in operation and cannot be turned off.
Source
RETAIN tip: H205146
Symptom
All IBM LCD Uninterruptible Power Supply (UPS) units are equipped with the Advanced Battery Management (ABM) function. This feature is permanently in operation and cannot be turned off.
Affected configurations
The system is configured with one or more of the following IBM Options:
- IBM LCD Rack UPS, type 5395, any model
- IBM LCD Tower UPS, type 5396, any model
This tip is not system specific.
This tip is not software specific.
Additional information
How Advanced Battery Management works.
The battery life depends on the ambient temperature, the number of duty cycles, and the prevention of internal corrosion of a battery. Internal battery corrosion is caused by current flowing through the battery. Internal corrosion can be reduced if the battery is charged and discharged as little as possible. The battery is only charged when necessary, this is called intermittent charging. The battery charge cycle is as follows when the battery originally is fully charged:
| |
2 days charging
28 days resting
2 days charging
28 days resting
etc. |
Doing this means that corrosion is occurring only during the two day charging cycle. This means that 90 percent of the time there will be no additional corrosion. During this 30 day cycle, the battery voltage drops by less than 2 percent, which has no effect on the backup time of the UPS. During the resting time, the ABM function constantly monitors the battery status. If the voltage drops below a predetermined alarm level, the charging cycle is started again. The same happens if the UPS is needed during the rest period to backup a power failure. This increases the battery life time by an average of 50 percent.
Furthermore, if voltage per cell reaches 2.1 volts on the batteries within the first 10 days of the rest period, a battery failure alarm will be raised.
If the voltage per cell reaches 2.1 volts after the first 10 days of rest, the batteries will be charged again for two days. This means that the rest cycle may be shorter than 28 days as batteries age and become older.
This function has no impact on the daily operation of the UPS unit.
System x Hardware Options:Operating system independent / None
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