Battery draining, from 81% to 0 instantly

Question

Level 1

4 points

Battery draining, from 81% to 0 instantly

Since installing iOS 15.7.1, I have noticed battery draining that is just out of the ordinary. With a battery health rating of 87%, it should no tbe the fault of the battery. Using an app such as Google browser, YouTube or Facebook will see the phone - usually charged to 81% - reboot without warning, and then claim to have only 10% left. There is just no reason for this savage emptying of the battery, which has me leaving the phone on charge just to use it. God help me if I am outdoors and receive a call! Will the battery just empty itself right when I need it?

iPhone 6s, iOS 15

Posted on Nov 27, 2022 12:16 PM

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Answer 1

lexOS1

Community Specialist

Nov 29, 2022 1:02 PM in response to rayflute

Hi rayflute,

Thank you for participating in the Apple Support Communities. If your iPhone battery is draining, here are a few steps to try to see if they help:

1. Restart your iPhone to see if the issue persists: Restart your iPhone - Apple Support

2. Check out the link here for more details on iPhone Battery and Performance: iPhone Battery and Performance - Apple Support

3. Try the steps here to see if they help: Batteries - Maximizing Performance - Apple

4. If you need further support, reach out to Apple Support here: Contact - Official Apple Support

Have a great day.

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Answer 2

Alancito

Level 7

27,466 points

Nov 29, 2022 2:28 PM in response to rayflute

rayflute ~ That 87% max capacity is just an algorithmic estimate of a dynamic chemical process and Apple considers a value around 80% to be unhealthy. However, after four years, a battery is likely to be weak and due for replacement - which is why you're seeing those classic symptoms of battery discharge.

...So, have the battery replaced and all will (probably) be well:

iPhone Battery & Power Repair

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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Answer 3

rayflute Author

Level 1

4 points

Nov 29, 2022 1:57 PM in response to lexOS1

Thank you for the reply.

Just done a restart, and the battery went from 94% before the restart, to 64% on restart, to 1% on trying to input my pin. Once logged in and charging, the battery goes from 80% down to 10%. The phone clearly has no idea what the battery is doing!

Maximum capacity is stated as 87%, and Peak Performance Capability is intact.

iOS version is 15.7.1, and if I am very honest, this issue has only been troubling me since upgrading to this very version. I can recall no such issues with version 15.7.0. If it were possible to revert to 15.7.0 I would choose that option, because this phone has become unusable unless constantly being plugged in.

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Answer 4

Alancito

Level 7

27,466 points

Nov 29, 2022 2:34 PM in response to rayflute

rayflute wrote: "iOS version is 15.7.1, and if I am very honest, this issue has only been troubling me since upgrading to this very version."

rayflute ~ The long process of applying an iOS update to an old iPhone with a weak battery can be the proverbial "straw that broke the camel's back."

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