The Best Portable Chargers and Power Banks for Phones and Tablets · Fits in a wallet: TravelCard Charger and TravelCard Charger (USB-C). 1. Anker PowerCore Highly portable and packs enough juice for a couple of refuels. Capacity: 10,mAh | Output Ports: 1x USB. Key Features. For MacBook, iPad, iPhone, USB Devices; 27,mAh Capacity; 2 x USB Type-C | 1 x USB Type-A.