Belkin UPS, not working (Walkers Heath B38)

If you would like this, please call my freegle-only number: 07440 324044. I am not easily able to check and respond to messages posted here.

Probably not working - I've been unable to test it. Could well be about 20 or more years old.

Label says model BU304000ukDB, but I can't find a manual online for it. There's one similar

Removing the lid, I can see that the lead-acid battery is present (but likely needs replacing) and the wiring etc looks sound.