This seems to be a reputable seller, recommended in this post, (the post said “He’s a member on BLF”)
It’s a store in Canada, a translation error is rather unlikely. I would hope that a protected battery would be safer than unprotected one. But it looks like a kind of one-time use battery.
Re-reading the product description, I see
So is that when PCB kicks in? And is this call tripping the PCB? What is “undercharge” BTW? A charger which is too weak?