PowerBoost X1 2600mAh Premium Portable iPhone Charger Rechargeable Battery With USB To 8-pin Connector Cable (Works with iPhones 5 / 5s / 6) And With USB To Micro USB Cable (Works With Most Android Phones) from Duroplus
Works great. I do a lot of traveling and this is exactly what I needed to keep my phone charged without having to stand around waiting for a charge.