I’m not sure I learned anything from watching this video. My biggest fear is a battery igniting when Im asleep or not at home.

Good LiPo bags work for small batteries. The batteries in most ebikes would burn through those. You can find video tests that show this. For ebike-sized batteries you need an ammo can. Even then if you want to ensure your home doesn’t get poisoned with fumes, it should be in a ventilated area, garage or outside.

For RC car batteries, you need something called a “bat-safe”, which will also filter the smoke to a certain extent.

In the case of an E-bike or e-scooter, those batteries are far too big, and often integrated into the frame, which makes them nearly impossible to fully protect without total isolation.