Battery health on 2020 MacBook decreasing rapidly.

Question

Battery health on 2020 MacBook decreasing rapidly.

Hi everyone,

I've had my MacBook for about a month and a half now and I've noticed that the battery health has dropped by 3% already, and is continuing to decrease at a rapid rate. This is strange because I keep my MacBook plugged in ALL the time, using it as a desktop far more than a laptop. Because of this most of the time the laptop is bypassing the battery and using the power adapter for the necessary power (as stated by the menu bar)

Furthermore, I went into the power section of the about Mac page and discovered that I only have a measly 15 charge cycles since the purchase of my device. A rough calculation shows that just by roughly 100 charge cycles my Mac will be down to 80% battery health! I read somewhere that this number should only be reached after 1000 or so charge cycles.

This concerns me a lot as I love everything about this Mac, but it seems my battery is already giving up the ghost :/

in this screenshot my MacBook is plugged in and fully charged, as it is most of the time.

MacBook Pro 13″, macOS 10.15

Posted on Oct 3, 2020 12:35 PM

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Answer 1

Oct 3, 2020 12:50 PM in response to Kieranbarker95

Relax, what you’re seeing is normal. Batteries normally decline non-linearly to ~90% over the first 100-200 cycles, then stay there for a long while. My relatively new 16” MBP is at 96% health after ~15 cycles. My 2017 15” MBP is at 91% health after ~330 cycles. My 2010 17” MBP is at 87% health after ~770 cycles.

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Answer 2

John Galt

Level 10

155,288 points

Oct 3, 2020 1:03 PM in response to Kieranbarker95

... A rough calculation shows that just by roughly 100 charge cycles my Mac will be down to 80% battery health!

A battery's maximum charge capacity as a function of charge cycles or time is not linear. Extrapolation is invalid.

Measured over a short period it will both increase and decrease. The longer term trend measured over a period of months or years is down.

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Answer 3

Oct 3, 2020 3:18 PM in response to neuroanatomist

Thanks for the info. As of writing this the battery health just decreased to 96%. If I don't see a slowdown of battery drain like you've said then I think that's probably a cause for concern. ill give it another couple of weeks/months and see where I'm at. Hopefully it will start to slow soon.

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Answer 4

Oct 11, 2020 9:28 AM in response to neuroanatomist

MacBook Pro 13" 4TB Port

Although I take all the precautions, mine decreased to 92 percent after 30 cycles.

Charging between 30-80 percent.

While I was getting 9-10 hours usage at first cycles with canceling turbo boost now I only get 8 hours max.

I think battery qualities decreasing, my older macbooks were way better in terms of battery or it could be also software apple made getting worse.

I'm starting to regret not switching to pc. I hope they solve this.

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Battery health on 2020 MacBook decreasing rapidly.

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