What is the best recommend battery backup charger for Nexus 5X?

[AC Question]

Looking for a battery backup charger that can charge the phone as quickly as the original wall adapter. Most battery chargers do not have USB type C output port. Is "Anker PowerCore 20100" the only option for fast charging?

 

[N4Newbie]

I have one of these Portable NEW USB-C Type-C 10000mAh External Battery Charger Power Bank Aluminium | eBay

Works very well. Don't be fooled by the Anker's claim of 4.8A output - it is actually 2.4A per port; it cannot output all 4.8A to a single port. In fact, I am not aware of any power pack that can do more than 2.4A per port.

Also - a warning: USB-C chargers have this funny quirk due to the USB-C specification - if you don't follow the instructions carefully, each and every time, you can end up using your phone to charge the battery instead of the other way around, resulting in a totally discharged instead of charged phone.

 

[N4Newbie]

Also, pay attention to the weight of any external battery you are considering. The larger capacity models can be insanely heavy; 12-1/2 ozs may not sound like much, but when you are carrying it around in your backpack all day, every day, it starts to get uncomfortable really fast.

 

[billthompson84]

I really like the Anker Astro E1 5200mAh. Its relatively small and easily portable, but packs enough power to recharge my phone with power to spare.