Are Portable chargers allowed on air plane?

Normally the output voltage is 5v, so the allowed capacity shall be 20000 mAh. If you bring a Dexinly Portable Charger upto 20000mah in Your Carry-On, Unless you are carrying car batteries or spare lithium batteries, all major battery types are generally allowed on a plane. ... For safety reasons, you must to bring your batteries in your carry-on. New regulations have made this mandatory on most airlines.