Fast charging during operation?

[LordG]

Samsung mobile phones have historically been limiting
the total power throughput to very menial 6 Watts (i.e. around 9V 0.67A 5V 1.2A instead of 9V 1.67A), rendering fast charging effectively useless while the device is in operation.
The full 15W were only reachable while the device was either in stand-by mode or completely switched off.

There is no technical reason for this limitation.

Is that still the case on the Note 10? And what about the S10, Note 9, S9 and Note 8?

Online sources confirm that that the S8 does have this limit (presumably 6W too), but after that, I am not sure.

Can anyone confirm that the Note 10 (S10, Note 9, S9, and Note 8) no longer have this despicable limitation?

 

[Jaycemiskel]

They still have it. It's annoying, but it is what it is.

 

[strikeIII]

Samsung mobile phones have historically been limiting
the total power throughput to very menial 6 Watts (i.e. around 9V 0.67A 5V 1.2A instead of 9V 1.67A), rendering fast charging effectively useless while the device is in operation.
The full 15W were only reachable while the device was either in stand-by mode or completely switched off.

There is no technical reason for this limitation.

Is that still the case on the Note 10? And what about the S10, Note 9, S9 and Note 8?

Online sources confirm that that the S8 does have this limit (presumably 6W too), but after that, I am not sure.

Can anyone confirm that the Note 10 (S10, Note 9, S9, and Note 8) no longer have this despicable limitation?

Mine still says fast charging while I'm using it but I'll have to wait until I get home to attach the meter to get the actual reading.

 

[strikeIII]

With the stock cable and charger it does indeed drop while using the device to about 8.24w/0.98A. Even though it still says fast charging in the notification with the same time until full. With screen off and AOD on I'm getting around 18w/1.98A.

 

[Mooncatt]

There is no technical reason for this limitation.

There is a technical reason. Heat is a major damaging factor with Li-ion batteries. Charging heats up the battery. The faster you charge, the more the heat increases. When using your phone, that obviously heats up the processor, which can transfer into heating the battery as well. When doing both at the same time, it would be easy to overheat the battery if running at full speed. Throttling the charge rate helps prolong battery life.

If you can get some cool air flow over the phone to help dissipate heat, that may help limit the amount of throttling.

You should feel lucky. LG throttles much much more. Just turning the screen on and idle, I top out at just over 800mA. If I'm actively using the phone, it often drops to around 450mA, and occasionally into the 200mA range.

 

[Rukbat]

When doing both at the same time, it would be easy to overheat the battery if running at full speed. Throttling the charge rate helps prolong battery life.

It could also overheat the CPU, causing immediate failure, and the need for a new motherboard.

 

[Mooncatt]

It could also overheat the CPU, causing immediate failure, and the need for a new motherboard.

That I haven't heard of before, but it's not good for the battery either way.

 

[Rukbat]

Well, that was my point - it's also not good for the CPU. (If the temperature inside the phone goes up, the temperature of everything goes up, and the cooling ability goes down. (Cooling with warmer air is less efficient than cooling with cooler air.) And once you reach the point at which the CPU fails (which varies a few degrees from chip to chip), that's the end of the motherboard, unless you find someone who can do good reflow work and replace just the chip (which is very rare these days).