Charging iPhone 13 Pro Max

iPhones have internal smart chargers and smart batteries.

Plug in and charge whenever you need to.

No damage is done by keeping it plugged-in.

Note that keeping it plugged-in overnight is the easiest way to enable routine iCloud backups via WiFi.

Next … ANY Apple USB power adaptor ever made can be safely used: as long as it’s paired with a cable terminating in a lightning connector.

If you are new to iPhones and don’t have an old adaptor, the “right” one to purchase is Apple’s 20w USB-C adaptor.

Lastly, the Apple store has numerous 12 volt power adaptors you can use in a 12v receptacle in your car.

For a more comprehensive treatment of this subject, see this:

When to charge your iPhone or iPad - Apple Community

tess104 wrote:

Preserving the battery life and preventing it from burning up is not micromanaging. It is taking care of your stuff.

A battery will not “burn up” solely as a matter of what approved power supply is used. There may be marginal benefits to employing certain techniques or perhaps reducing charging current, but the benefit for longevity would be minimal. I’m all for things like reducing the maximum charge level if the process is automated, but Apple doesn’t have a programmable setting for that.

If you really insist, you can charge with a 5W cube to limit the input to 1A. That won’t damage the battery in any way and might even reduce the heat generated when charging before reaching the saturation phase (where charge current is reduced no matter what). But in the end it’s going to be of minimal benefit, and the price of a battery replacement is reasonable.

It’s up to you if you want to chase marginal longevity increases by sacrificing convenience. I’ve personally just charged with whatever suits me, including draining down to 0% and seeing the auto shutoff, seeing a few thermal warnings, using the highest power supplies available, etc. I’ve got nearly 600 cycles on my battery and it’s reporting 92% battery health. Life’s too short to worry about every last detail. Does the battery serve you, or do you serve the battery? Once it’s no longer suitable, get the battery replaced.

Hello ~ I addition to the excellent advice provided by * Chattanoogan * take a look here:

When to charge your iPhone or iPad

~Katana-San~

The reply from Chattanoogan is 100% spot on. Attempting to micromanage the charging process on any modern Lithium based battery is a lesson in futility. If you wish to charge your phone in a different manner, by all means do so.

Re: “… This was not helpful. I knew all of this information …”

I regret not performing up to your expectations.

Perhaps had you provided your Curriculum Vitae I might have crafted a more appropriate reply.

Hello again ~ We are only trying to assist you and the information provided is correct and helpful.

~Katana-San~

Hello ~ You certainly met my expectations.

~Katana-San~