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Most 12V lithium ion battery packs are 3 cell batteries. Each cell has an operating voltage of 3.7V. 3.7 x 3 = 11.1V
High 10s to low 11s is normal for the battery. If your FF truly will only operate above 11V, then this battery won't work for you. You will probably only get a third of the actual run time before it goes below 11.
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