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[Anandtech] Qualcomm Quick Charge 5 - 100W Charging Potential

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post #1 of 21 (permalink) Old 07-27-2020, 07:16 PM - Thread Starter
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[Anandtech] Qualcomm Quick Charge 5 - 100W Charging Potential

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We’ve all been familiar with Quick Charge and its various implementations over the years, innovating beyond the classical USB power delivery limits of 5W over 7 years ago. In recent years, we’ve seen the maximum charge speeds continuously improve, going from 10W in Quick Charge 1.0, to 18W in 3.0, to up to 27W in recent 4.0-certified chargers which make use of USB-PD.

Today for Quick Charge 5, Qualcomm is again changing the charger and PMIC architecture to be able to quadruple the charging speeds, allowing up to 100W of charge power.


Source - https://www.anandtech.com/show/15928...pps-up-to-100w

Finally a charging upgrade that actually is going to make a difference. QC 2 was great but QC 3 & QC 4 weren't much of a change. Now QC 5 has crazy huge potential here, though it's going to be up to manufacturers on whether they make full use of the new ability.

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post #2 of 21 (permalink) Old 07-27-2020, 11:21 PM
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High end phones are already thermally limited much of the time at 27w—I don't have much faith in seeing 100w going into much of anything except large tablets in short bursts in an air conditioned room. The real limit is the internal resistance of the cells. That said, moving more of the voltage regulation out of the phone should help with thermals.

All in all, I like the improved efficiency and thermals, but I don't like dumping a ton of current into a "non"-replaceable battery. I wish these advanced QC5 chargers would come with a "slow charge" mode that limits charge current to 1 or 2 amps to help reduce battery degradation. Better yet, I'd like phones to have user enable-able options to limit charge current(or even charge level).

My last phone's battery lasted 22 months of daily use before degrading to 60% with a 5v/850ma charger. After that I replaced the battery(which required specialty screwdrivers, glue, and a heat-gun to install) and switched to the OEM QC3(12v/1.5a) charger. The replacement battery only lasted 12 months. Maybe the battery wasn't as good as the original(It measured fine when new), but I think the higher current from the quick charger played a big role in the accelerated degradation.

For my new phone I've taken to just charging to 85%. Thankfully, the SD730 is very power efficient.

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Last edited by qwertymac93; 07-29-2020 at 08:32 AM.
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post #3 of 21 (permalink) Old 07-29-2020, 03:37 PM
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And what batteries are they going to put into the phones?
There is a practical limit of what even large high discharge/charge rate, low impedance lipos can take.

Phone batteries are notorious to wear out fast due to their tiny size, capacity and overall capabilities/quality.

Overall a good practice for lithium batteries is to charge at 1C max if you want them to last. Plus a lot of these batteries can only take high current/power at low charge levels and then become voltage limited and slowly charge up to max. CC/CV charging. So they are making the CC charging faster but who wants to carry around a 100W power brick as a phone charger? On top of that they keep raising the voltage over the user USB cables so they can keep the current down over the crappy USB cables. So the phone itself then has to drop the voltage down to what the battery can actually accept = wasted heat in the phone.
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post #4 of 21 (permalink) Old 07-29-2020, 04:36 PM
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Well you could split the cells of the battery up and charge them individually. Some of the newer 65w phones already use a dual-cell battery technology to do that. And some chargers use multiple usb-c pins to charge faster.

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post #5 of 21 (permalink) Old 07-30-2020, 02:48 AM
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Damn and i thought 30w was fast.

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post #6 of 21 (permalink) Old 07-30-2020, 05:51 AM
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battery type, configuration and design is indeed the limiting factor, and lets not even talk about those cheapo battery from god knows where the manufacturers got them.

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post #7 of 21 (permalink) Old 07-31-2020, 06:43 PM
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I don't give a damn about how fast things can charge. Can we go back to making thicker phones with batteries that can last more than 1.5 years?

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post #8 of 21 (permalink) Old 08-01-2020, 06:26 AM
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I'll be happy if batteries stop doing this


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post #9 of 21 (permalink) Old 08-01-2020, 08:16 AM
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Quote: Originally Posted by Diffident View Post
I'll be happy if batteries stop doing this


sploded battery
Too true.

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post #10 of 21 (permalink) Old 08-01-2020, 10:50 AM
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Quote: Originally Posted by qwertymac93 View Post
I wish these advanced QC5 chargers would come with a "slow charge" mode that limits charge current to 1 or 2 amps to help reduce battery degradation. Better yet, I'd like phones to have user enable-able options to limit charge current(or even charge level).
Use battery charge limit.

https://play.google.com/store/apps/d...limit&hl=en_US


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