I recently had to replace the batterypack on my APC Smart-UPS 3000 RM, which I ordered from shop4power. It was as cheap as I could get. (And I mean 112 euro is really cheap!)
I had to reinstall apcupsd (latest version I could find) because I could not write the battery-installdate into the EEPROM. I took the package from the Debian unstable repository. I decided to update the apcupsd-cgi scripts package also. The latter presents a statuspage in a webbrowser which is also fancy to have.

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