WHAT KINDS OF BATTERIES ARE ALLOWED IN CARRY-ON BAGGAGE (in the aircraft cabin)?
Passengers can carry most consumer batteries and personal battery-powered devices. Spare batteries must be protected from damage and short circuit. Passengers can bring two (2) larger lithium ion batteries (more than 8 grams, up to 25 grams of equivalent lithium content per battery) in their carry-on. This size covers larger extended-life batteries such as the SUPER CPAP POWER PACK.