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.

I bought the 512Gb OLED, and within two months decided I needed to upgrade the storage. I replaced the drive with a 2Tb drive, and I’m much happier. That said, I download a ton of stuff and keep it on there. I don’t often play a single game straight through, so I like having the ability to have a wide variety at any given time. Replacing the drive is trivial if you’re handy at all.

I would buy direct, I wouldn’t trust getting something second hand. I’m sure plenty of people are selling their LCD for an OLED, but I would rather go direct unless you’re getting an amazing deal and have some level of purchase protection.