A BMS inside the battery box that can be triggered independent of the Segway's motherboard is a good design. Lots of transportation requirements that large lithium batteries stay connected to circuits that protect them from abuse. Abuse that could cause fires.
Like having a fuse installed closest to the battery (it is inside the battery) instead of far downstream the circuit path.
That the Segway's motherboard didn't refuse to start up with such a low battery is the poor design. The battery's BMS and the motherboard have different ideas on what is a critically low battery?
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