I still would think twice about doing DIY battery work in a multi-family unit. I wanted to get into FPV drones but reading about the concerns with battery charging and issues with minor damage, I decided I had nowhere to safely charge and passed on it.

I haven't looked into it too much, but I'm also curious if your insurance would have a major issue, and if you open yourself to possible criminal/civil legal troubles if you start a fire due to a botched unattended DIY battery setup.