A single faulty AA battery belonging to a passenger was responsible for an emergency landing two hours into the cross-country flight.
https://www.notebookcheck.net/Lithium-ion-battery-catches-fire-aboard-flight-to-San-Francisco.224902.0.html
Please correct it - its definitely not AA battery. Its standart 18650 type battery that was original designed for laptops (and still used in laptops as pack of 4 or 6 cells). This battery is much larger than usual AA battery. Also, according to CNN photos it looks like a AMT brand battery - not any kind of quality cells.