Some of the cheaper battery packs cut off charging after a certain temperature is reached in the battery pack, and they only use 1 sensor...just 1 sensor.
IF I ERE A LANDLORD-—I WOULD BAN SUCH THINGS FROM BEING IN/NEAR MY PROPERTY HOLDINGS
Lithium ion batteries are packaged bombs...
There is a long ways to go to make these sometimes lethal chemical explosives reliably safe and foolproof for daily handling by unsophisticated individuals.