So, to reiterate one of the key issues for larger packs, because there is a larger potential hazard if the pack malfunctions or is subjected to abuse conditions, multi-cell packs often implement a second independent safety circuit to protect against “worst case scenarios.” The secondary protector is typically a simple, hardware-only device that will blow a fuse or some other safety element just in the case that the main battery management fails to protect against a fault condition. The second protector trip thresholds for a safety event are set just above the tolerance of the main protector, so that the second protector activates only if the primary protector does not respond to a fault.