Large capacity for multiple charges The Romoss SW20PS+ is equipped with a 20,000 mAh battery, so it can charge your smartphone up to several times. Are you an iPhone 8 owner? The powerbank can charge it up to eight times! The Huawei P10 can be charged 4.3 times, the Oppo R11s 4.3 times, and the Vivo X9 4.5 times. Fit Charge technology provides broad compatibility with the most popular smartphones and tablets, as well as the Nintendo Switch.