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Apple Computing Products:
macOS - Notebook Hardware
Computer shutting down at 20% battery
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<blockquote data-quote="MBasile" data-source="post: 623537" data-attributes="member: 23801"><p>Well the other day, without thinking, I tried to start up the MacBook after I had drained the battery, as I pushed the button I remembered it was supposed to be dead and wouldn't turn on, but it turned on! The computer had died before the battery was truly empty. So I let it drain all the way again to the point when it wouldn't turn on. I took the battery out of the computer and let it sit for 2 days completely drained, and then tried to recharge it last night. </p><p></p><p>However now it is doing something weird. It got to about 75% of a charge (I had the computer off, but was monitoring the LEDs on the battery itself) and the light would be flashing saying it was charging, but then it'd go steady, like it wasn't charging and the MagSafe would turn from red to green for a second. Then the MagSafe would go back to red and the battery would flash as if charging. I turned on the computer and then status menu says how much time is left until full charge, but the MagSafe keeps going to green and then the status says "calculating..." and then it'll come back with a time different from 5 seconds ago!</p><p></p><p>Very frustrating until I came upon this: <a href="http://www.apple.com/support/macbook_macbookpro/batteryupdate/" target="_blank">http://www.apple.com/support/macbook_macbookpro/batteryupdate/</a></p><p>I did the update when it came out, and it says it extends the warranty to 2 years for the battery! One of the symptoms ("low performance/life at full charge with less than 300 cycles") fits my situation, although I barely squeaked under the cycle limit. I shall be going to my local Apple Authorized Service Center tomorrow before work <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="MBasile, post: 623537, member: 23801"] Well the other day, without thinking, I tried to start up the MacBook after I had drained the battery, as I pushed the button I remembered it was supposed to be dead and wouldn't turn on, but it turned on! The computer had died before the battery was truly empty. So I let it drain all the way again to the point when it wouldn't turn on. I took the battery out of the computer and let it sit for 2 days completely drained, and then tried to recharge it last night. However now it is doing something weird. It got to about 75% of a charge (I had the computer off, but was monitoring the LEDs on the battery itself) and the light would be flashing saying it was charging, but then it'd go steady, like it wasn't charging and the MagSafe would turn from red to green for a second. Then the MagSafe would go back to red and the battery would flash as if charging. I turned on the computer and then status menu says how much time is left until full charge, but the MagSafe keeps going to green and then the status says "calculating..." and then it'll come back with a time different from 5 seconds ago! Very frustrating until I came upon this: [url]http://www.apple.com/support/macbook_macbookpro/batteryupdate/[/url] I did the update when it came out, and it says it extends the warranty to 2 years for the battery! One of the symptoms ("low performance/life at full charge with less than 300 cycles") fits my situation, although I barely squeaked under the cycle limit. I shall be going to my local Apple Authorized Service Center tomorrow before work :) [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
Computer shutting down at 20% battery
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