this post was submitted on 20 Oct 2023

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Do portable charges prioritize iphones charging speed over androids? (self.android)

submitted 1 year ago by Meruem to c/android

14 comments fedilink hide all child comments

My xiaomi portable fast charger clearly charges my girlfriend's iPhone faster than my high end android device. Doesn't matter which port, which cable or which android phone. It starts by charging fast but as soon as I plug her phone the fast charging speeds go straight to hers and mine just chargers very very slowly.

I've got the impression that this may be on purpose or at least has some clear explanation.

Any thoughts?

all 16 comments

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[–] cynar 21 points 1 year ago

Assume from the various pd fun that could be occurring, it could be voltage related. Android phones often set their charge current by the input voltage. If the voltage sags, the phone assumes it is overloading the cable and backs off. If the Iphone and Android phone are sharing a 5V rail inside the charger then this could be an issue. If the combined load of both phones causes a voltage sag, the android phone will back off. However, if the Iphone doesn't also slow down at the same rate, you will get a bias. It might be that 90% of the power is going to the iPhone simply because the android phone is being polite, and being screwed by the deal.

The best way to test this is to install a charge monitoring app on the android phone. I personally use AccuBattery. It shows me both the voltage and current draw of my phone. The pulsing effect of a bad cable is very obvious with it. I suspect it would help you diagnose what is going on.

[–] [email protected] 17 points 1 year ago* (last edited 1 year ago) (1 children)

Does the charger display how quickly it is charging? I assume her iPhone's battery might just have a lower capacity as iPhone usually have smaller batteries than comparable Android devices.

[–] SkyezOpen 5 points 1 year ago (1 children)

A good way to check would be to download an app that measures battery charge/discharge rate.

[–] [email protected] 4 points 1 year ago (1 children)

What app do you recommend? I use accubattery. Is there something more simpler.

[–] SkyezOpen 4 points 1 year ago

I think the one I used is called Ampere. Pretty straightforward, just shows basic info like charge/discharge rate, temp, battery type, and a few other things.

[–] davidgro 16 points 1 year ago

Could it be as simple as the iPhone having a smaller battery?

[–] [email protected] 15 points 1 year ago* (last edited 1 year ago)

Are they both using USB PD charging? Chinese brand phones often have weird proprietary charging protocols like OPPO VOOC for example.

Also if the ports are shared on the charger internally, plugging multiple devices in may limit what charging protocols and power levels are available.

It's not on purpose, but due to the complexity of USB and different charging protocols, and different charger designs.

[–] [email protected] 12 points 1 year ago

Xiaomi makes Android phones, what would they get out of trying to make iPhones look better.

Most likely explanation is the voltage difference people have mentioned

[–] bappity 6 points 1 year ago

there are a few factors to it for example your android might have a higher battery capacity

or her iPhone might support faster charging speeds

[–] [email protected] 5 points 1 year ago

Just means it's a shit charger that can't handle multiple devices at once because that requires higher quality electronic components.

[–] MargotRobbie 4 points 1 year ago (1 children)

Are they both charging through a USB-C port? There are different levels of USB-PD specifications, and the charging speed depends on the maximum supported wattage of USB-PD between either the device, cable, or charger.

What's the model of your high end Android device, jf you don't mind us asking?

[–] Meruem 3 points 1 year ago (1 children)

Both using regular USB to USB-C and lightning port respectfully. I have an S22 Ultra and she has a iPhone 11 Pro

[–] MargotRobbie 2 points 1 year ago

USB-A (or what you call regular USB) only supports older versions of the USB power delivery standard, while the charging standard on a lightning port is proprietary.

So, it could be that your charger doesn't support the level of fast charge your phone is capable of: basically, your charger is telling your phone that it doesn't know how to charge your phone super fast safely over USB, so it will try to charge it slowly in the way it knows; it knows how to charge a phone over Lightning slightly faster, so that's what it does.

Try getting a GaN based charger with at least one 45w based USB-C output port. (Anker, if you want a brand recommendation) and your phone should be able to get a much better fast charge from USB-C to USB-C.

[–] Fares 2 points 1 year ago

I've the exact same issue with my Baseus 100W power bank. It'll charge my S23 ultra super fast. Once I plug iPhone 14 pro, it'll charge it much faster than mine. Even if I unplug/plug again.

I think the issue with the power bank is because I've another 65W wall charger that'll charge both fast.