There are probably newer ones that come with LiPos. But every consumer grade one I’ve seen is traditional lead acid batteries.

…(it is kinda like a bomb after all)…

WAT? I’ve never heard a UPS referred to as “kinda like a bomb” before.

Keep your UPS maintained, replace the batteries when they age out, and it will be fine. If your UPS supports automated self-tests, use them.

My employer has UPS units spread all over the region we operate in, and we don’t have any issues, despite leaving them mostly unattended for years. I have several in my house and I’ve never given them a second thought aside from battery replacements.