tubezninja t1_j4ncj04 wrote on January 16, 2023 at 10:49 PM

Reply to comment by EScootyrant in iPhone 13 Pro Max charges to 50-60% and stays like that rest of the night while plugged in. Does this happen to anyone else? by Whiffler

You’re not doing anything that optimized charging won’t do better for you

Whiffler OP t1_j4o3grz wrote on January 17, 2023 at 1:59 AM

I usually charge on slow chargers (5W or 10W) overnight to avoid heating up the battery. Is it better to just stick with the usb C (20W or even more?) brick and let the phone optimize the charging?

EScootyrant t1_j4ndkcl wrote on January 16, 2023 at 10:56 PM

Well, I'm after preserving Battery Capacity (99% currently) for the time being. Though I have (2) 20W USBC adapters, a MagSafe puck, an NOS 5W (at work) plus several USBC cables (all OEM Apple) at my disposal..Slow charging is best for prolonging Li-ion batt life/less stress to battery (when in no hurry or for overnight charging).

_--TiTaN--_ t1_j4pxpuy wrote on January 17, 2023 at 1:15 PM

It’s not always that clear, charging with 5V requires more amps and that will lead to components heating up. So you may no be doing any favours to your battery by charging with slower brick (unless it’s one of those 5V 1A brick)

I had flir picture of power bank with charging chip running at 110C/230F charging at 5V 2.5A, can’t find it though, probably deleted.

There’s a reason why electricity from power plants is transferred at up to 1.000.000 Volt.

“The USB PD PPS (programmable power supply) technology determines the charging status of a battery in real-time, adjusting the voltage and current to deliver maximum power while minimizing the temperature rise.

Qualcomm’s Quick Charge technology has evolved with a focus on temperature management. Quick Charge 2.0 added Dual Charge, which uses two power-management ICs (PMICs) in the handset to split the charging current into two streams. This reduces handset and, therefore, a rise in battery temperature.

…

Quick Charge 3.0 without Dual Charge+ is up to 6° C cooler, 16% faster, and 38% more efficient than Quick Charge 2.0, and Quick Charge 3.0 using Dual Charge+ is up to 8° C cooler, 27% faster and 45% more efficient than Quick Charge 2.0 with Dual Charge.”

https://www.batterypowertips.com/how-fast-can-li-on-batteries-be-charged/

EScootyrant t1_j4qsopg wrote on January 17, 2023 at 4:55 PM

I am aware of those you posted above. Did research prior to buying those Apple adapters.

However, explain to me why 13 PM get very warm with the 20W Apple wall wart?

With the 5W brick, this 13 PM is cool to the touch. Both times were inside a case.

_--TiTaN--_ t1_j4qt90p wrote on January 17, 2023 at 4:58 PM

What was the temperature difference?

30C feels warm to the touch but it’s nothing for battery.

EScootyrant t1_j4qtlyr wrote on January 17, 2023 at 5:00 PM

Idk, it is always very warm with the 20W. Always. Worse if I use the wireless MagSafe puck.

_--TiTaN--_ t1_j4quikg wrote on January 17, 2023 at 5:06 PM

Yeah, with MagSafe 25% of energy is wasted as heat (takes 20 watt but delivering only 15 to phone). 20 watt is almost at limit how fast 13 can charge (22watt max I think), and 5 watt (5V at 1A) charger is super slow in comparison. That’s why in my original comment I said specifically that if you use that charger you’ll be good. How long does it take to fully charge? Must be 4h at minimum?