08-23-2017 09:31 AM
The Lenovo USB-C charger works fine. A key purchase reason for this laptop was to be able to charge over USB-C.
08-23-2017 10:10 AM
I have no experience with that charging bank, but it appears to be underpowered. You need 20V 2.25-amps (45W). The maximum output at 20V is 1.5 amps (30W).
08-23-2017 10:26 AM
When connected to a lower power source, the system used to respond with "This will charge slowly". Does that no longer happen and the computer now only accepts full power charge?
08-23-2017 02:20 PM - edited 08-23-2017 02:23 PM
My most recent experience with underpowered adapters were with W530 and W540. What I remember is that the machine would charge slowly with a 90W adapter if it were turned off, but the charger was ignored if the machine was running. Normally it used a 170W charger. With USB-C charging, the computer or phone sends its power requirements and then the adapter sends it if it can. If it cannot, it sends nothing. I don't know of a way the charger could tell the laptop that it is underpowered. The round or slim tip adapters communicated the wattage via the resistance between the signal pin and ground.