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187 votes
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What happens if you plug more than one charger in the new MacBook Pro (2016)?

The system will choose the power source that provides the most power, and it will not draw power from the others. Apple has released a support article (and another one) describing this: Your MacBook ...
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89 votes
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Is charging my iPhone all night harmful?

Technical Lithium Polymer batteries, such as those used in the iPhone, are a very well understood battery chemistry and use specific chargers to manage their charging. While the latest charging ICs ...
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  • 8,773
29 votes

Is charging my iPhone all night harmful?

No, it's not harmful. Modern phones are smart enough to stop the electric current when fully charged. That may have been a problem before lithium-ion batteries, but nowadays you shouldn't have to ...
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  • 541
9 votes

Is charging my iPhone all night harmful?

No it does not. Nightly charging is the norm today for many people, and unlike older technology from a few years ago, today's lithium ion based batteries use newer technology and battery life is not ...
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8 votes

Is charging my iPhone all night harmful?

Leaving the iPhone to charge overnight doesn't affect your iPhone drastically. As phones are very smart, once it gets fully charged, it knows when to stop the current from coming in to protect the ...
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6 votes

Should I disconnect my MacBook Pro's power cord when the battery is fully charged?

Don't worry about it and just use your MacBook Pros for what you bought them for. Why? Physics. No matter what you do, you can't change the laws of physics and lithium batteries are governed by age ...
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6 votes

How do I charge my iPhone 6 without it being on the whole time?

Plug the phone in to power Then turn it off If your charger is overloaded, faulty or your cable has issues, there could be an interruption of charge and the device will start up then. There's no way ...
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  • 221k
6 votes

Is charging my iPhone all night harmful?

As someone who works for a battery specific retailer and is asked this question a lot, the answer is "it won't hurt it in the short term, but in the long term it will shorten its lifespan." Between ...
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  • 69
6 votes
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iOS 10 remember to "not trust this computer"

Unfortunately, iOS 10 cannot remember untrusted computers. From Apple support document HT202778: If you choose not to trust a computer, you block its access to content on your device. You'll see ...
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  • 331
5 votes

Is charging my iPhone all night harmful?

According to Apple, when an Apple device reaches full charge, it stops charging. It's true for their macs and all other devices.
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  • 151
5 votes

What happens if you plug more than one charger in the new MacBook Pro (2016)?

They don't push power (watts) but they do push VOLTAGE. And if a charger pushes the wrong voltage, bad things can happen to your device. The voltage is negotiated between devices (e.g. charger/mac), ...
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  • 95
4 votes

Can I get an alert when my iPhone 5S is unplugged?

You can reach that with the shortcut-app by creating an automation: Open Shortcut-App and create a new Automation (click +) Choose "Create Personal Automation" Scroll the page down and ...
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3 votes

Is charging my iPhone all night harmful?

The charge controllers which charge the battery are really smart. They are designed by really great companies such as ST Microelectronics. These charge controllers typically have many features. (I ...
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  • 161
3 votes
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Prevent iPhone "Trust this computer" on work PC

You can buy "charge only" cables. For examples open Amazon and type "usb charge only cable" in search. Electrically a "charge only" just connects the power pins, and not the serial date pins ...
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3 votes
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Are my battery cycle counts increasing when MBP is on and plugged in?

If your battery is at 100% and your MacBook is plugged in then the battery isn't charging or discharging, so it isn't using a charging cycle.
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3 votes
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Is there a way to see the amp levels while charging my iPhone?

I don't believe so. The available API for battery state in iOS gives you only 5% resolution. It might be possible to write an app that polls battery state and calculates a rate of charge based on ...
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3 votes

Macbook Pro won't start after restart (red charger icon)

It is unlikely that the installation of Flash did anything to your power system, it is likely just a coincidence. How long have you left the charger plugged in to the Mac? I would give it an hour, ...
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3 votes
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Why does macOS show 100% battery and fully charged when "Charge Remaining" is lower than "Full Charge Capacity"

This is completely normal. The numbers you see here should not be treated exact values - it is impossible to get exact values for the battery. The full charge capacity varies slightly with various ...
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2 votes
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Event based on battery charge level

Well, this question is old but I ran into a similar situation and wanted to run a shortcut (with "Siri Shortcuts") on macOS 12 on certain battery levels. Instead of a background service I ...
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  • 136
2 votes
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Prevent iPhone from charging when plugged into a battery powered MacBook Air

I don't know if there is a software way to do that, but there is an hardware way: Use an unpowered USB cable (some company makes it, targeting audiophiles), might need an adapter to male lightning. ...
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  • 1,063
2 votes

iPhone 4 Stopped Charging

From iPhone and iPod touch: Charging the battery: If your battery doesn't charge, or if your device shows a low-battery image, black screen, or "accessory not supported" alert, follow these steps. ...
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2 votes

Is there a way to see the amp levels while charging my iPhone?

I cannot speak for official apps, but I know that for jailbroken iDevices, there is a console/Terminal command that can be run called powerlog that provides live feedback about power usage, (dis)...
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  • 881
2 votes

Is it safe to charge a MacBook Air after the green LED shows?

Is it safe to leave in? Yes. To understand this better we need to know what is happening when you have your charger plugged in. What do the LED's on the MagSafe Charger Mean? Amber: Battery is ...
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  • 82.3k
2 votes

My iPad isn't charging

Make sure you are using an official Apple charger. Sometimes the cheap chargers are hit-or-miss. I have a generic lightning cable for an iPhone that I bought at a gas station, and sometimes it works,...
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2 votes
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At how many battery cycles should I consider replacing my battery?

Charge Cycle means nothing, assume you plugged in all the time for 5 or 6 years, the cycle is still 0 but does it mean your battery is 100% health? No. You should search for your macbook model to ...
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  • 136
2 votes

At how many battery cycles should I consider replacing my battery?

You haven't mentioned what's the model of the Mac you are using, Apple's Determining battery cycle count for Mac notebooks will tell you more about the Charge Cycle. Also in case you are still in ...
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  • 1,597
2 votes
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Power for my US laptop in Europe

You could purchase the "Apple World Travel Adapter Kit" from an Apple Store or from Apple.com before you leave. I do not know if this kit is available overseas (not the US). $39 EDIT #1: You could ...
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  • 1,219
2 votes

What happens if you plug more than one charger in the new MacBook Pro (2016)?

This person tried it and it lost its ability to charge. Given this Apple support page that Alan Shutko linked in his answer, however, my guess is that this damage would be covered by the warranty.
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  • 157
2 votes

What is the maximum wattage an iPhone X will support for wireless charging?

I assume your question is about the software support for wireless charging and not the potential capacity the hardware may support. Initially all iPhone models that supported wireless charging (i.e. ...
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