Rapid charging indicator: What triggers it? (technical question)

[anon(10268214)]

I can see Google not supporting ALL forms of rapid charging; but still, the inconsistency is baffling. Of course, Google doesn't advertise the Pixel as 'Qualcomm quickcharge compliant' anyway. Even for rapid charging, I have only ever seen them refer to their own stock charger.

Having said that, I was disappointed when I learned the quickcharge 3.0 car charger I bought especially for this phone didn't quick charge my Pixel 2. Especially when almost every other phone using a Qualcomm chipset these days seems to support some version or other of QC.

 

[Itsa_Me_Mario]

I can see Google not supporting ALL forms of rapid charging; but still, the inconsistency is baffling. Of course, Google doesn't advertise the Pixel as 'Qualcomm quickcharge compliant' anyway. Even for rapid charging, I have only ever seen them refer to their own stock charger.

Having said that, I was disappointed when I learned the quickcharge 3.0 car charger I bought especially for this phone didn't quick charge my Pixel 2. Especially when almost every other phone using a Qualcomm chipset these days seems to support some version or other of QC.

I'm glad they don't support QC 3. Overvolting the inbound connection to boost speed is a terrible idea and can lead to premature battery wear.

 

[Mike Dee]

I can see Google not supporting ALL forms of rapid charging; but still, the inconsistency is baffling. Of course, Google doesn't advertise the Pixel as 'Qualcomm quickcharge compliant' anyway. Even for rapid charging, I have only ever seen them refer to their own stock charger.

Having said that, I was disappointed when I learned the quickcharge 3.0 car charger I bought especially for this phone didn't quick charge my Pixel 2. Especially when almost every other phone using a Qualcomm chipset these days seems to support some version or other of QC.

Unfortunately there isn't an industry standard. PD is most likely the future and offers additional benefits. One advantage of PD is use of the data connection within USB-C while charging.

 

[anon(10268214)]

I'm glad they don't support QC 3. Overvolting the inbound connection to boost speed is a terrible idea and can lead to premature battery wear.

Actually QC 3.0 is designed to lessen battery wear by working at optimal voltage and current, and therefore reducing heat stress on the battery.

Whatever floats your boat. For me, Google only officially supporting it's stock charger for fast charging is quite disappointing. Perhaps it's because they cheaped out on the USB-C port. I noticed it doesn't seem to support USB 3 data transfer speeds either.

 

[Itsa_Me_Mario]

They support USB Power Delivery, rather than proprietary options. That's a good thing. Everything that utilizes power delivery and everything with sufficient current will fast charge the pixels.

The Pixel 2 supports USB 3.1, which is backwards compatible with 3.0, etc.

Actually QC 3.0 is designed to lessen battery wear by working at optimal voltage and current, and therefore reducing heat stress on the battery.

Whatever floats your boat. For me, Google only officially supporting it's stock charger for fast charging is quite disappointing. Perhaps it's because they cheaped out on the USB-C port. I noticed it doesn't seem to support USB 3 data transfer speeds either.

 

[anon(10268214)]

They support USB Power Delivery, rather than proprietary options. That's a good thing. Everything that utilizes power delivery and everything with sufficient current will fast charge the pixels.

The Pixel 2 supports USB 3.1, which is backwards compatible with 3.0, etc.





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Interesting. I guess it might be just a software glitch then, unless 'charging rapidly' means different things to different OEMs. At any rate it takes me at least an hour to fully charge even with the stock 'rapid' charger on my 2700mah Pixel 2, so it's not really anything to write home about as far as charging speeds go, regardless of what tech they are using.

I will have to look into why USB 3 speeds don't seem too be supported on my PC, even with a fully compliant cable. Perhaps it's an issue with my computer. I'm curious to see what setups other people are using to harness the full speed of the data connection?

 

[Itsa_Me_Mario]

Interesting. I guess it might be just a software glitch then, unless 'charging rapidly' means different things to different OEMs. At any rate it takes me at least an hour to fully charge even with the stock 'rapid' charger on my 2700mah Pixel 2, so it's not really anything to write home about as far as charging speeds go, regardless of what tech they are using.

I will have to look into why USB 3 speeds don't seem too be supported on my PC, even with a fully compliant cable. Perhaps it's an issue with my computer. I'm curious to see what setups other people are using to harness the full speed of the data connection?

I'm not sure on the data speed thing, sorry My first go to would be to double check that your Google drivers are up to date and second, which you seem to have already checked, would be to double check that you're using a USB 3.0 or 3.1 C to C cable with no adapters (USB 3 type C to A doesn't seem to work well for anything) - but honestly that sort of thing I play around with stuff until I figure it out, I don't just know the answer. Sorry again.

 

[anon(10268214)]

I'm not sure on the data speed thing, sorry My first go to would be to double check that your Google drivers are up to date and second, which you seem to have already checked, would be to double check that you're using a USB 3.0 or 3.1 C to C cable with no adapters (USB 3 type C to A doesn't seem to work well for anything) - but honestly that sort of thing I play around with stuff until I figure it out, I don't just know the answer. Sorry again.

The adapter that comes in the box seems to be mainly for either transfer data from one phone to another (ie. during setup) or hooking it up to a USB device such as a memory stick. I have actually used it for a phone setup once, which was very slow and another reason I suspect the data transfer speeds are not quite up to par. Anyway, look forward to seeing if anyone else has had better luck with it than me. So far on both charging speed and data transfer I'm 0/2. Lol.

 

[Almeuit]

So many responds are off topic. This thread supposed to be What triggers the "charging rapidly" on the Pixel. So far, it's not the type off chargers. The correct type, PD, the QC, and just an regular 2.0amp, all can give the Pixel "charging rapidly" status. But why? Shouldn't it the only one that can charge the Pixel rapidly is the PD type? Why the QC and the regular one both can change the Pixel rapidly?

Well .. the brick you use will be the cause of "Changing Rapidly" or not so .. I see it as on topic.

 

[PowrDroid]

I'll be on the look out for that.

Yes, I see it now. It appears for less than 2 seconds when the charger is first plugged in and then disappears.

I don't know why I thought it appeared next to the digital clock readout on the AOD. Is that where it appears on the original Pixel XL?

 

[PowrDroid]

Interesting. I guess it might be just a software glitch then, unless 'charging rapidly' means different things to different OEMs. At any rate it takes me at least an hour to fully charge even with the stock 'rapid' charger on my 2700mah Pixel 2, so it's not really anything to write home about as far as charging speeds go, regardless of what tech they are using.

Google throttles the rapid charge rate once the battery gets to about 97% - 98%. I guess they do this to avoid bumping up against 100% for long periods of time.

Next time you charge your Pixel 2 observe the numbers for the first half hour to forty-five minutes or so. I think you will see that it is indeed rapidly charging. I did a bunch of experiments when I first got my 2 XL (which has a 3,520 mAh battery) and I could charge from 50% or so up to 95% in about forty-five minutes.

 

[Mike Dee]

Google throttles the rapid charge rate once the battery gets to about 97% - 98%. I guess they do this to avoid bumping up against 100% for long periods of time.

Next time you charge your Pixel 2 observe the numbers for the first half hour to forty-five minutes or so. I think you will see that it is indeed rapidly charging. I did a bunch of experiments when I first got my 2 XL (which has a 3,520 mAh battery) and I could charge from 50% or so up to 95% in about forty-five minutes.

I thought that it throttled at a lower threshold but now I'm not so sure.

 

[anon(10268214)]

Google throttles the rapid charge rate once the battery gets to about 97% - 98%. I guess they do this to avoid bumping up against 100% for long periods of time.

Next time you charge your Pixel 2 observe the numbers for the first half hour to forty-five minutes or so. I think you will see that it is indeed rapidly charging. I did a bunch of experiments when I first got my 2 XL (which has a 3,520 mAh battery) and I could charge from 50% or so up to 95% in about forty-five minutes.

My Pixel 2 seems pretty close to standard charging rates even with the stock 'rapid charger'. The OEM charger is rated at 5V/3.0a and 9V 2.0a. Theoretically, the maximum time it should take to fill a 2700mah battery with a standard 2.1a charger is about 1.4hrs (at 10% efficiency loss), which is more or less what you get from the stock charger on a Pixel 2. And it works out almost exactly the same on a 2xl if you are getting it's 3500mah battery 45% charged in 45min. (3500/2700 = 1.3, 1.3 x 1.4hrs = 1.8hrs = 109min, 45% x 109min = 49min.

So basically...despite the fact it may be able to step up the amperage for a so called fast charge (at least for a limited time) overall it doesn't seem much better than a standard 2.1a charger.

Maybe there is something to be said about Qualcomm's proprietary charging technology after all. They claim QC 3.0 is capable of up to 4.6a with 90% efficiency...which could theoretically charge a 2700mah battery in just 36 minutes.

 

[PowrDroid]

I thought that it throttled at a lower threshold but now I'm not so sure.

It's possible it might start in at slightly lower thresholds. It seems when I deliberately charge it to 100% (which isn't often), it takes forever to get from 97% to 100%.

 

[Raymond Czaja]

When I use the Google supplied charger it always say charging rapidly. At night I use my charge from my old lgg4 and it doesn't say charging rapidly but fully charges from say 50% to 99% in almost the same amount of time? (give or take 5 min). Since A Droid Pie. it rarely seems to get to 100%? Yet battery life seems about the same.