keep in mind, battery safety applies to everything that uses rechargeable batteries, not just PV's. Dell and Sony were setting peoples cars on fire a few years ago with laptops. The technology involves dangerous chemicals most likely extracted from the sun or from a deal with evil ogres in the Earth's core or something, i'm not an expert.
but either way, use proper equipment and care with PV batteries, cell phone batteries, laptop batteries....umm...i'm sure there's other stuff that uses batteries but my brain hurts.
With those other devices we trust the manufacturer is doing their part in putting the right battery in them. It's not like with vaping where we buy batteries and insert them ourselves. Or buy batteries from one place and the charger from another.
With a laptop or cellphone, the battery is already in there and the device comes with its own charger in the package. Many of us only know of the regular batteries that we buy for kids toys and stuff like that. We've never dealt with AW IMR 18650, just to name one. Or even eGo type batteries.
I still don't know much about batteries, I just buy the recommended ones and the charger that is recommended for the battery from the place I purchased my PV from. I do know enough, from reading on ECF, that you do need to know things if you choose to buy outside of the site that you purchased your PV from. Which is another reason I do not purchase anything outside of my comfort zone. I like simple and sweet
I do not charge overnight, even though my charger is supposed to quit charging after the battery is full. Not worth the risk if something malfunctions. We all know that there is nothing on this earth that is 100%.....except dying.