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I have access to a couple of Acer TravelMate B3 and B3 Flips here.
The manual for these laptops say the USB-C port can charge with input of 45W in 5/9/15/20 volts.
Unfortunately, I can't get 9V charging to work on multiple chargers, and some chargers that support 15V or 20V won't negotiate at anything more than 5V.
I am an IT professional and have access to a lot of different USB C cables from different brands including Anker, UGreen, Cable Matters, and many more, in many different lenghts up to 10 foot/3 meters. I also have various power meters and cable testers, and different laptops and USB PD devices to compare with.
The big problem is with 20W and 30W chargers like the Ravpower I mention below. I have a couple of others from UGreen, INIU, AOHI, and other weird brands, and almost none of them will charge at more than 5W with a normal 6 foot cable.
While I can get a few chargers and cables to negotiate at 20V, in general, these laptops often downgrade to 15V, and longer cables (2-3M) cause more problems than short cables.
Here are some examples...
Lenovo ADLX45YAC3D charger. Won't negotiate at 20V, falls back to 15V. This is a common charger that comes with a wide variety of Lenovo laptops.
Dell HA45NM180 charger (DPN 01J12J). Won't negotiate at 20V, falls back to 15V. Another super common 45W charger.
Ravpower RP-PC150. This is a small 20W adapter that does 5/9/12V output. The TravelMate B3 won't negotiate at 9V with any cable at all. It's always 5V and the current pull is very poor, often sub 1A, even on short cables.
Baseus 65W GaN Charger. This is a very popular charger which has 2 C ports. The TravelMate won't do more than 15V on the C1 port with a 6 or 10 foot cable, and won't do more than 9V on the C2 port with a 6 or 10 foot cable. It also won't do more than 15V on the C2 port even with a 1 foot cable.
Tested with the latest UEFI 1.19 on multiple TMB311s.