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There are over 7500 of the 18650 form factor cells in a Tesla pack and they don't recommend storing them with a high state of charge . . . . but maybe Elon Musk doesn't know better??
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18650 is indeed a
physical form factor, but that does not define the chemical technology. Segway uses lithium iron magnesium phosphate cells. (formerly called "Saphion", from Valence Technology). This is a much safer technology than most other common lithium ion cells. They can be shot with a gun, crushed, and skewered without the cell generating enough heat to set fire to adjacent cells (thermal runaway).
Consequently, what Elon Musk recommends for his automobile batteries is not very meaningful for other technologies. Jason of MTOBATTERY on this forum knows Segway LiIon batteries. He's the "go to" guy for how to treat Seg batteries properly.