After isolating an issue on your Mac to a possible hardware issue, you can use Apple Diagnostics to help determine which hardware component might be causing the issue. Apple Diagnostics also suggests solutions and helps you contact Apple Support for assistance.
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Battery Optimizer, as the name implies, is a free software to optimize your laptop battery performance. It also lets you run diagnostics to test laptop battery performance. How to test laptop battery using this free software. On its main interface, in its Home tab, you can view Battery Health. Jan 11, 2017 Following its own testing, Consumer Report reported low battery life on Apple's new MacBook Pro machines and as a result could not recommend the laptops. Apple questioned the.
If your Mac was introduced before June 2013, it uses Apple Hardware Test instead.
How to use Apple Diagnostics
- Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
- Make sure that your Mac is on a hard, flat, stable surface with good ventilation.
- Shut down your Mac.
- Turn on your Mac, then immediately press and hold the D key on your keyboard. Keep holding until you see a screen asking you to choose your language. When Apple Diagnostics knows your language, it displays a progress bar indicating that it's checking your Mac:
- Checking your Mac takes 2 or 3 minutes. If any issues are found, Apple Diagnostics suggests solutions and provides reference codes. Note the reference codes before continuing.
- Choose from these options:
- To repeat the test, click ”Run the test again” or press Command (⌘)-R.
- For more information, including details about your service and support options, click ”Get started” or press Command-G.
- To restart your Mac, click Restart or press R.
- To shut down, click Shut Down or press S.
If you choose to get more information, your Mac starts up from macOS Recovery and displays a web page asking you to choose your country or region. Click ”Agree to send” to send your serial number and reference codes to Apple. Then follow the onscreen service and support instructions. When you're done, you can choose Restart or Shut Down from the Apple menu.
This step requires an Internet connection. If you're not connected to the Internet, you'll see a page describing how to get connected.
Learn more
If holding down the D key at startup doesn't start Apple Diagnostics:
- If you're using a firmware password, turn it off. You can turn it on again after using Apple Diagnostics.
- Hold down Option-D at startup to attempt to start Apple Diagnostics over the Internet.
As you use your Windows 10 laptop, the battery goes through a number of charges and discharge cycles that slowly wear it down. Calibration isn't for the dead battery sitting in storage; it's for a battery that still works properly, yet doesn't show an accurate reading when it comes to life remaining. For example, it might say that there are two hours of juice left, but after 45 minutes you'll get a warning that it's about to shut down. After calibration, you'll usually get a more accurate reading, and while it may be depressing to see that your old laptop is only getting about an hour of power from a charge, you won't be stuck somewhere with a dead device.
Hardware and software for this guide
- AC power pack: EWEMOSI AC portable power bank ($120 at Amazon)
- USB-C power pack: ZMI USB PD power bank ($70 at Amazon)
- Microsoft's latest OS: Windows 10 (From $139 at Microsoft)
How to calibrate the battery in your laptop
If you're comfortable accessing your PC's BIOS, you might find a battery calibration tool within. This all depends on the laptop and manufacturer, so don't be alarmed if you can't find it.
Likewise, some laptop manufacturers will include a calibration tool within Windows 10 in order to easily take care of the problem. However, this type of tool isn't common, so you must take things into your own hands. Luckily, the process is relatively painless. Here are the steps to get it done, broken down into five separate parts.
Change your power plan
Before going through the hassle of charging and discharging your battery, we must first change the power settings to keep your laptop from sleeping or hibernating too soon. This is intended to be a straight draw on the battery and letting it go into a power-saving mode will ruin the calibration.
- Right-click the battery icon in your taskbar.
- Click Power Options.
- Click Change when the computer sleeps.
- Click the dropdown menu next to Turn off the display.
- Click Never.
- Click the dropdown menu next to Put the computer to sleep.
- Click Never.
- Click Change advanced power settings.
- Click the expand button next to Battery.
- Click the expand button next to Critical battery action. Ensure the section next to On battery says Hibernate.
- Click the expand button next to Critical battery level.
- Click the percentage next to On Battery.
- Click the down arrow to set the number as low as possible.
- Click Apply.
- Click OK.
- Click Save changes.
If you don't plan on using the laptop while the battery discharges, ensure you have a screensaver set up.
Charge your battery
Now that the power settings are taken care of, you want to charge your laptop's battery up to 100%. When it's completely charged, leave it plugged in and wait for the battery to cool down. Depending on your laptop and battery, this can take up to a few hours.
Unplug your laptop and let it discharge
Now that your laptop is cooled down and the battery is fully charged, you can unplug the cable. You can use the laptop during this time. Always make sure it doesn't go to sleep or hibernate (at least until the very end), although the power settings you changed should take care of this.
Charge your battery again
Once your laptop's battery is completely drained and the device shuts off, you'll want to plug it back in and let it charge back to 100%. Feel free to use your laptop during this time.
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Once you're charged back up to full, your laptop should give you a much more accurate reading of how long the battery will last.
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Reset your power plan
Now that your battery is calibrated, be sure to reset your power plan to how you had it before. No sense in wasting battery when the device isn't in use.
Our top equipment picks
If the battery in your laptop isn't showing great life after calibration, you can always pick up a replacement battery for a relatively affordable price depending on the laptop in question.
Alternatively, you can invest in an external battery pack that you can plug into with either an AC adapter or USB-C cable. For the former option, we recommend EWEMOSI's AC portable power bank, which has a 31200mAh capacity, 100W output, and plenty of other ports besides the AC plugin.
AC battery bank
EWEMOSI AC portable power bank
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Lots of power for the road
Can't be near an AC wall outlet and battery life not up to snuff? This power bank will keep your laptop running longer, and you can plug in with your usual AC adapter.
If you'd rather have a slimmer power bank that uses USB-C to charge, ZMI's USB PD backup battery and hub is a great option. It has a 20,000mAh capacity, 45W output, and it comes with multiple ports for charging other devices besides your laptop.
USB battery bank
ZMI USB PD power bank
Slim USB-C power
![Laptop Laptop](/uploads/1/2/6/3/126375130/537446645.jpg)
If you don't like the bulk that generally comes with AC power banks, this option from ZMI is slim and sleek but still provides 45W output and a 20,000mAh capacity. This is a great pick if your laptop charges via USB-C.
Additional Equipment
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