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As others have said, changing UPS batteries is required maintenance, and I agree 18-24 months is the typical service life for even high-end UPSs. However, you may want to look into LiFePO4 based UPSs, which can handle many more charge-discharge cycles and often have 5-year warranties. More expensive and potentially not as recyclable as lead acid batteries, but maybe appropriate for your use case.
If your batteries are dying that fast, you're doing something wrong.
You're saying that data centers are replacing batteries constantly...just imagine the labor costs on that (and the down time), not even considering the material cost.
I work in enterprise, and have never heard such a thing. Even my friends in SMB routinely replace UPS's at the 5-year mark, the same time they replace servers. They rarely replace batteries, at all, it's so rare that it's notable.
I’m the tech doing the battery replacements. The big boy UPSes are typically a 3-5 year replacement cycle. Something like this:
(I just picked the last one on my phone so not a great picture, they’re about the size of a small refrigerator)
On rack mount and desktop style UPSes 18-36 months isn’t unreasonable. Some of the smaller UPSes, like APC 750s, go through batteries even faster. My personal theory is that they just get and stay too hot.
There is typically zero downtime while servicing any of them, every critical system has redundant power supply and battery replacements usually don’t interrupt power output anyway. It would take multiple failures to cause any sort of significant downtime, and if it would, we just do them during scheduled downtime.
If you drain the UPS past 50% it really kills the life of the batteries.
In the Enterprise you probably have generator backup. So the UPS only need to keep things running for 30 second to a minute. So that never happens.