I use my Google Nexus 6P to take some HDR+ photos while travelling, and it drains considerable battery power. I am looking for a power bank probably 20000 mAh or more. But I am not aware of any particular one that charges my phone "rapidly" similar to power adaptor using USB Type C port. It would be great If I could charge the power bank itself rapidly as well.
Can any one please suggest any power bank to me?