can i bring 10000mah power bank on plane:- The majority of airlines and airport security regulations permit power banks with a capacity of 100 watt-hours (Wh) or less to be transported in hand luggage without a specific permit as to my knowledge ending in September 2021. You may multiply the milliampere-hours (mAh) by the voltage (often 3.7V for most power banks) to get the watt-hours of a power bank. The capacity of a 10,000mAh power bank would be 10Ah (10,000mAh x 1,000) and the watt-hour rating would be 37Wh (10Ah x 3.7V).