Yes, got 2 that need new 24V battery packs to run, just looking for some used but good lead acid batteries for them, as they are 1kVA units.
You will also notice the heatsinks are just a big thermal mass, no fins to dissipate the heat, just a big enough thermal mass so the power dissipated in them during the 15 minutes or so of backup operation will not get them to the shutdown temperature before the batteries reach low voltage under the massive load imposed on them. Then the unit sits there till power comes back on, waits the on power delay and energises the transformer relay and the output relay and uses the incoming mains to rather brutally charge the batteries till they reach the lower float voltage, then change to trickle charge mode to finish the charge. Periodically it will do a self test on the batteries by powering the DC Dc converter to charge the output capacitors and monitor battery voltage for droop, and sound an alarm ( plus also show on the built in web server if the accessory LAN interface is installed) showing battery health. That 5V regulator really needs a better heatsink, the one it is on is not really going to be good without the fan blowing over it, as it likely has close to the battery voltage on the input, or there is a 12V regulator on the big block of aluminium that feeds it.
More modern ones track battery life as well, so will have reduced predicted runtime as the batteries age, so they can give a predicted shutdown signal when power is lost so the load can initiate a controlled power off and command the UPS off instead of it just dropping the load on low battery without notice. Bet that one was beeping for months before they had a power failure and it simply shut off after 5 seconds, never to turn on again.