Testing Battery Capacity
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Testing Battery Capacity
Batteries in the BBU need to be replaced periodically. A battery test should be
run every four weeks in order to get a reliable estimate of battery capacity, and
to determine when it needs to be replaced.
The battery test is used to measure the battery’s capacity to back up write data.
In order to make a reliable estimate of battery capacity, the BBU pre-charges
the battery before it proceeds with a full discharge cycle. The battery is
automatically charged again after the test completes. The whole process
usually takes between 8 and 12 hours.
While running the battery test and until charging is completed, write cache is
temporarily disabled.
For how to replace the battery, see the installation guide that came with your
controller.
To test the battery in a BBU in 3DM 2
1
On the menu bar, choose
Monitor > Battery Backup
.
2
On the Battery Backup page, click the
Test Battery Capacity
link.
Figure 86. Battery Backup Information Screen in 3DM
3
When a message cautions you that testing the battery will disable the
BBU for up to 24 hours, click
OK
to continue.
After the battery test starts, you will see the voltage start dropping;
eventually the battery voltage will say "LOW". This is part of the battery
test. After the voltage drops to a point, it will start charging again, and the
status will change to “Charging.” Eventually, the battery voltage will say
“OK” again.
