5th November 2018

How Good Is Reverse Wireless Charging on the Huawei Mate 20 Pro

I can't lie, I'm a bit of a sucker for a gimmick on a phone, so when I saw the Huawei Mate 20 Pro had reverse wireless charging, the ability to turn your phone into a wireless charging pad, I knew I had to give it a go.

Yesterday I finished my video review of the Huawei Mate 20 Pro but I realised I'd not really tried reverse wireless charging. The review was already close to 30 minutes long, so I figured I had better deal with this separately. This morning I've been using it to charge my Pixel 3 XL and here are some of my findings.

Reverse wireless charging from the Huawei Mate 20 Pro to Pixel 3 XL

It's not particularly reliable

Looking at my logs, you get a lot of 'unplugged'... 'charging'....'unplugged'

Inconsistent Charging with reverse wireless charging from the Huawei Mate 20 Pro

On the rare occassion it finds a good 'connection' it then charges about 18% per hour, which isn't actually too bad.

Reverse wireless charging from the Huawei Mate 20 Pro

It kills your Huawei Mate 20 Pro Battery

I'm not naive enough to think we're going to get 100% mA passed over to the new device, probably not even 80%. Hell, even a wired battery pack only passes around 65% of it's power, so what would be reasonable with this?

Reverse wireless charging from the Huawei Mate 20 Pro kills your battery

When it's actually working properly, we get exactly 50% efficiency. The 9% we give to the Pixel 3 XL, cost 18% of my Huawei Mate 20 Pro battery. Now, you could get techincal and work out the actual mA given the Pixel 3 XL has a smaller battery, but I don't feel we need to be that accurate.

When it's not working though, it's kind of a waste of time.

Device 10:17am 10:47am % Change
Pixel 3 XL 30% 35% +5%
Huawei Mate 20 Pro 56% 43% -13%

In half an hour, I've drained 13% of my battery and only provided 5% to the Pixel 3 XL... not a good use of my own battery power!


I love the idea and when it works, it's actually not too bad. Given that both devices were running as normal, syncing data and such, passing 9% over in half an hour using 18% of my own battery is probably acceptable. The problem lies in it's unreliability. I don't think there was any way to know it wasn't working properly. On the Pixel 3 XL Always On Display it even said charging rapidly, when it wasn't working well, so how can I tell?

For now, it's a nice gimmick, which if you're friend is really stuck for options, you could try, but there's a reasonable chance you're just going to waste each others time and your own battery...