Here is another compact gadget that lets you charge your Apple Watch and iPhone everywhere you go. The Belkin Valet Charger has a 6700 mAh battery and supports Apple Watch (both generations), iPhone 7, iPhone 6s Plus, and older devices. It has a magnetic charging module for smartwatch.
This is a MFi certified charger. It can be recharged using a Micro-USB cable. Expected to ship in November for under $75.[where to get it]