You can access the battery replacement date in the Powerchute Personal Edition software which should help. If you are unable to access this setting, you may try to perform a manual runtime calibration. The runtime calibration requires you place 30% or more load on the unit and remove power until the unit fully exhausts itself. Once the battery is exhausted, plug the unit back in and allow to recharge to 100%. the runtime should have now increased.
You should be able to change the battery installation date through PowerChute Personal Edition. Go to Rnu Selft-Test and you will see Replace Battery Date.
If your system is not Windows you can install APCUPSD and set the replace battery date through that application.
THANKS so much!
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