Originally Posted by Jetstream
Once the cells reach a critical internal temperature (c 135c IIRC) they proceed to break down and self ignite and no fuse is going to help them after that point
polyfuses trip at 125'c either from external heating or internal heating and will stay at that temp while there is a fault. Hope the protection device didn't overheat thebattery it was supposed to protect.
Last edited by Interested Passenger; 4th Aug 2013 at 15:36.