OnePlus power bank 20000mAh This passthrough charging feature might not look like A great deal, but I've uncovered this to become super beneficial the two for use on a desk or nightstand and when traveling. This means I can have a single tiny wall charger charging up the power bank, https://arqoob.com/product/742/baseus-10000mah-power-bank-3a-fast-charging-dual-usb-ports-2-in-1-portable-charger-black