[KaiserPro]

It could have.

But

replacing a UPS is usually done to right time pressures. the problem is, you can rarely de-energise UPS batteries before replacing them, you just need to be really careful when you do it.

Depending on the UPS, Bus bars can be a mother fucker to get on, and of they touch energised they tend to weld together.

With lead acid, its pretty bad (think molten metal and lots of acidic, toxic and explosive gas, with lithium, its just fire. lots of fire that is really really hard to put out.

[gtech1]

Don't you have to put UPS's in bypass mode precisely for this reason while doing maintenance on them ?

[KaiserPro]

Yeah, but the problem is that the batteries are still full of juice.

Obviously for rack based UPSs you'd "just" take out the UPS, or battery drawer, and replace somewhere more safe, or better yet, swap out the entire thing.

For more centralised UPSs that gets more difficult. The shitty old large UPSs were a bunch of cells bolted to a bus bar, and then onto the switchgear/concentraitor.

for Lithium, I would hope its proper electrical connectors, but you can never really tell.