The number of hours that a 10,000mAh power bank will last before needing to be recharged ultimately varies per each model of power bank. It depends on the type of battery the power bank has, as well as where you use and store the power bank, how old it is, and the number of devices you are charging. In addition, larger devices such as laptops or tablets will typically drain the power bank’s battery faster than smaller devices, such as smartphones or earbuds. The best 10,000mAh power banks have a long battery life and can charge a smartphone several times over, with some being able to power a smartphone 5 times over before needing to be recharged themselves!