Charge Rate not up to My Phone

Has not lived up to expectations in keeping my Pixel 2 XL charged. Was surprised to find my battery at 26% after a 2 hour drive. It was even warmed up before i took it into the car (was very cold out). Still had three dots of charge left in the power bank, so not sure what went wrong. I noticed that it had stopped charging though, like another battery pack, so don't know if there's something about the Pixel 2 that makes these drop out or what. My older Bonsai still works well though. If it's really putting out 2.1A, that should be plenty.

###

