2 Answers. Sorted by: 1. The positive (+) and negative (-) terminals on the battery are usually the outermost pins. Knowing the specific MacBook model is helpful here. The MagSafe 1/2 charger outputs 16.5 volts, so you are going to need a charger that supplies that amount.
Shut down your Mac. Wait until your Mac's screen is black before you continue to the next step. Turn on your MacBook Pro, then immediately press and hold Command + R at the same time. Continue holding these keys down until you see the Apple logo or another image. If prompted, enter your password to continue.
1. Since the cycle count of MacBooks is logged inside the battery, it is impossible to reset or reduce the count. The cycle count is a one-way trip. It keeps increasing but can't go back. Just like the TIME. However, you can replace the battery to bring the cycle count to 0. You can read more about MacBook Cycle Count at this blog post. June 20, 2019: Apple announces a battery recall program for MacBook Pros. Which brings us up to date. Apple said some older 15-inch MacBook Pro laptops are at risk of having batteries that may I checked that a month ago and it was at 1423 for a 4.5 year old 17 inch Macbook Pro. Battery lasts 4 hours on normal usage, 1.5 hours with heavy usage such. it’s pretty easy to replace your

Check for visual signs of battery age, swelling, or leak. Swollen batteries may manifest as difficulty in using the trackpad or the keyboard. As the battery expands, it exerts upward pressure on the underside of these components. If you need to, you can replace your MacBook battery with a quality-tested unit from our store.

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