Freebook N100 - charging with different chargers in Linux

Laptops Freebook 360
1

I wanted to find out whether different PD chargers have different charging speeds. The Freebook has 2 charging ports on the right.

I tested with 3 different chargers:

  1. original chuwi charger profile: 9Vx3A
  2. Dell 45W PD charger profiles: 9Vx3A / 15Vx3A / 20Vx2.25A
  3. Lenovo 65W PD charger profiles: 9Vx2A / 15Vx3A / 20Vx3.25A

I used this command line utility to monitor: upower --monitor-detail

The result is astonishing. According to upower the amount of power being charged is the same between all 3 chargers. Also it does not matter which of the 2 charging ports you use.

At 80% state of charge I measure around 9.x watt energy going to the battery, and below 65% the amount of power is 19.x watt.

If a non chuwi charger is used, upower will report “xx watt unknown” instead of “xx watt charging”

It seems that the energy going to the battery is maxed at around 20W. Upower cannot gauge the charger profile [VxA] that is negotiated between the charger and the laptop. Does it mean that any excess power provided by the charger will be dissipated as heat?

2

A charger will never require more mains power than requested by the laptop or it can deliver.

However heat is generated by inefficiencies.

That is when the charger converts mains power to direct current.

And also when the direct current of the charger is converted to direct current of the battery in the laptop itself.

Finally the battery also generates heat due to its chemical charging process.

So the more efficient the processes, the less heat.

Jaap

3

We read all linux topics, even though we cannot offer support. And i thank you for this information. Will be valuable to other customers for sure.

4

If you connect simple extended monitor c type, does it work in right port or left port ?

5

My under laptop external fan with 3 fans does not work from right port, it’s USB type, does not work from right