Ewarmer 2200mAh Powerbank for Bluetooth Earbuds (2 Packages), Portable Charger with USB Output, Portable Power Bank ,Battery Charger for iPhone 7/7 plus/6s/6s plus/ Samsung
I was very sceptical after seeing how small these were. But they work great. On charge on it charged my phone two times. They are very durable and small enough that you can take them everywhere.