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There is no universal phone-battery calibration routine. If a Pixel 6 or later (including Pixel Fold) turns off suddenly, Google provides a manual calibration sequence. For iPhone 11, 11 Pro, and 11 Pro Max on iOS 14.5 or later, Apple’s battery-health recalibration is automatic and works differently. Use the instructions for your model and symptom; calibration updates a battery estimate, not the battery’s physical condition.
First, identify what needs recalibrating
Battery calibration concerns the phone’s estimate or reporting of battery performance. It does not restore capacity lost through chemical aging. The right action depends on the phone and the symptom:
| Phone and scope | What the process addresses | What to do |
|---|---|---|
| Pixel 6 and later, including Pixel Fold | Google’s manual calibration guidance is for a phone that turns off suddenly. | Follow Google’s four-step sequence below. Google Pixel Phone Help |
| iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max with iOS 14.5 or later | Apple’s automatic recalibration of battery-health reporting, including maximum capacity and peak performance. | Continue regular charging and allow the process to complete. Apple Support |
These are different procedures for specific cases, not a single recipe for every Android phone or iPhone.
Calibrate a Pixel that shuts off suddenly
Google lists these steps for Pixel 6 and later, including Pixel Fold. They are not general instructions for all Android phones.
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- Restart the phone.
- Charge it to 100%.
- Use the phone until the battery is completely drained.
- Charge it to 100% again.
Google describes this as a way to calibrate the phone’s battery display to show the latest battery performance. The full drain is part of this limited procedure; it is not a recommended routine for everyday charging.
Understand iPhone battery-health recalibration
Apple’s documented recalibration applies to iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max running iOS 14.5 or later. It happens automatically during regular charge cycles; Apple does not instruct users to drain these phones to zero.
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- The process recalibrates the reporting of maximum capacity and peak performance and may take a few weeks.
- While it is underway, the displayed maximum-capacity percentage does not change.
- When it finishes, the reporting message disappears and the percentage updates.
- If the system finds significantly degraded battery health, a service message may appear.
Apple advises waiting for recalibration to complete before contacting service, because the health report may be inaccurate during the process. Read Apple’s instructions for battery-health reporting recalibration.
Do not make full discharges a charging habit
Outside Google’s specific Pixel procedure for sudden shutdowns, routinely draining a phone completely is not necessary. Apple says lithium-ion batteries can be charged whenever desired and do not need to be fully discharged before recharging. Apple’s lithium-ion guidance is general guidance for its batteries; follow the phone maker’s model-specific instructions when troubleshooting.
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Calibration cannot reverse battery wear
A corrected estimate is not restored battery capacity. Apple explains that chemical aging reduces how much charge a battery can hold and can also reduce its ability to deliver peak power. When aging has degraded performance, replacing the battery may help. Persistent short runtime, sudden shutdowns, or a service warning should prompt model-specific diagnostics and service guidance rather than repeated full discharges. Apple’s battery and performance guidance.
Apple gives design figures of 80% of original capacity at 500 complete charge cycles for iPhone 14 models and earlier, and at 1,000 complete charge cycles for iPhone 15 models, under ideal conditions. These are not guarantees for an individual phone: Apple says actual capacity depends on how the device is regularly used and charged. The figures are stated in Apple’s guidance published June 17, 2026.
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Check diagnostics if the problem continues
For Pixel 6 and later, including Pixel Fold, Google provides battery diagnostics and troubleshooting for ongoing drain. Check battery use, software updates, and overnight drain; Google says a Pixel losing more than 10% overnight should be investigated in Battery usage. If the battery icon shows a question mark, Google recommends inspection at an authorized repair center. See Google’s Pixel battery troubleshooting steps.
For other phone models, use the manufacturer’s support and diagnostic instructions for that exact device. A calibration step documented for one model family should not be assumed to apply to another.
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