This chager arrive with a charge of 75% and as recomended by the manufacturer I charged it to 100% before trying it. Well, it did not disapoint. I charged an iPhone 12 at 20% to 100% in about 1-1/2 hours. The charger is solid and has a good feel to it, the simple carringing case is a nice touch. It is a greaty product to have for power outages or for traveling. Overall, so far I am very please with my purchse.