If your Xiaomi phone’s battery percentage jumps unexpectedly or drains faster than usual, it may be time to calibrate your battery. MIUI provides tools and best practices to ensure your battery meter displays accurate readings. Proper calibration can help you better estimate battery life, avoid unexpected shutdowns, and extend battery longevity.

1. Understand Battery Calibration

Battery calibration does not improve battery capacity, but it ensures the software accurately reports the charge. Over time, the phone’s battery sensor may become misaligned, causing inaccurate readings like sudden drops from 50% to 20%. Calibrating corrects this discrepancy, making your battery indicator reliable.

💡 Important: Avoid using third-party “battery calibration” apps. MIUI handles calibration natively, and apps may give false readings or drain your battery.

2. Fully Discharge Your Xiaomi Phone

The first step is to drain the battery completely:

  1. Use your phone normally until it shuts down automatically.

  2. Turn it on again and let it shut down a second time if necessary.

  3. This ensures the battery is truly at 0%, preparing it for calibration.

⚠️ Tip: Avoid forcing shutdowns. Let MIUI handle the discharge naturally to prevent battery damage.

3. Charge the Phone to 100% Without Interruption

After full discharge:

  1. Connect your Xiaomi phone to the original charger and cable.

  2. Charge it to 100% without turning it off or unplugging.

  3. Avoid using the phone heavily while charging — occasional light use is okay.

This step helps MIUI recalibrate the battery percentage readings.

4. Perform a Full Reboot

Once fully charged:

  1. Leave your phone plugged in for about 10–15 more minutes.

  2. Reboot your Xiaomi device by holding Power → Restart.

Rebooting allows MIUI to synchronize the battery sensor with the software, completing the calibration.

5. Avoid Frequent Partial Charges

Frequent top-ups or charging from 30% to 70% can gradually affect battery reporting accuracy. To maintain proper calibration:

  • Occasionally let your battery discharge to around 10–15% before charging fully.

  • Do not repeatedly use quick charge for small battery percentages unless necessary.

💡 Tip: MIUI’s Adaptive Charging feature, found under Settings → Battery & performance → Battery protection, can slow down charging overnight to improve battery lifespan.

6. Check Battery Health in MIUI

After calibration, monitor battery behavior:

  1. Go to Settings → Battery & performance → Battery usage.

  2. Look for unusual drains or sudden percentage drops.

  3. If problems persist, consider updating MIUI or performing a system reset, as software bugs can also affect battery reporting.

7. Final Tips

  • Calibrate your battery once every 2–3 months; frequent calibration is unnecessary.

  • Avoid overcharging your Xiaomi phone overnight on older devices — use the Battery protection feature for modern MIUI phones.

  • If your battery still drains abnormally, it may be physically degraded, requiring a replacement at a Mi Service Center.

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