Originally Posted by
juliep
That is unfortunate. Maybe I can appeal to TSA as this is medically necessary.
It's an FAA regulation, not a TSA rule. Even if the TSA lets you bring it through the security checkpoint, the airline will not permit you to bring that battery on board the aircraft.
I strongly suggest that you ask your doctor to prescribe an alternative device that is powered by a battery which is allowed in carry-on luggage.