CyberPower UPSes come with manual, which among other things, clearly shows the battery replacement method with clear to understand pictures.Worse has been EVERY 3 years are the CyberPowers 1500VA
The APC SmartUPSOnline 1500s are easy because the 4 battery pack (RBC57 ) is in a plastic frame. The UPS can be put into bypass and the battery hot swapped. No downtime required.Computer/et al. power backup & surge protection units.
Best has been the Geek Squad 875VA = 4-screw door to battery on bottom
Worse has been EVERY 3 years are the CyberPowers 1500VA