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Chapter 12 Helpful information
Before the days of sealed, maintenance-free batteries, you could check the battery's electrolyte
with a hydrometer to determine its ability to retain a charge. Now, with sealed batteries, the
only way to measure battery capacity is to discharge the cell. To accomplish this, ABM
technology periodically initiates a brief discharge cycle to check the internal impedance which
is calculated and compared to the ideal. In addition, the open-cell voltage and decay rate of the
battery are continuously monitored after every charging cycle. Further, during a utility failure,
the actual capacity of the battery is measured and compared to the expected capacity. When
any of these three tests detect a significant change from the normal, the microprocessor
indicates, well in advance, when the battery needs to be replaced.
UPS Batteries
Attention!
When the UPS unit issues a battery fault alert, all batteries for the UPS installation have to be
replaced. This must include the following:
All batteries internal to the UPS unit
•
All batteries in any Extended Battery Module (EBM) attached to this UPS unit
•
The UPS unit cannot determine which battery is defective. It can only report the fact that a
battery is defective.
Never mix old and new batteries in the UPS unit or its EBMs.
Mixing old and new batteries in a UPS installation
Will lead to a thermal destruction of the UPS unit
•
It cannot be guaranteed that the UPS is able to provide the required and configured run
•
time in case of a power outage/fault that would switch the UPS to battery operation
When replacing UPS batteries it is strongly recommended to wear eye protecting goggles and
acid resistant gloves and shoes as leaking acid from batteries can cause injury!
Battery warranty statement
Most current warranty statement on Leonovo UPS batteries is available via
https://datacentersupport.lenovo.com/documents/UM924396
Replacement responsibility
UPS batteries are classified as Tier 1 CRU, Customer Replaceable Units. This means that UPS
batteries are to be replaced by the customer, in other words it is the customer's responsibility
to replace the batteries. The UPS batteries can be replaced by a System Service
232
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
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