iPhone Battery Error or No Health Info After Replacement？Here’s What to Do!

🔋 iPhone 14 Pro Battery Replacement – No Error, Original Performance with Polar Tech

Does your iPhone battery drain too fast or show warning messages after a third-party replacement? You're not alone. Many users report battery errors or degraded performance after replacing their original iPhone batteries — especially when using lower-grade alternatives.

In this blog, we’ll walk you through the step-by-step battery replacement of an iPhone 14 Pro, using a OEM battery from Polar Tech

— a battery that performs just like Apple’s original and doesn’t trigger system errors.

📌 Tip: If your iPhone battery capacity drops below 80%, it’s time to consider a replacement.

Before anything else, ensure your device is running iOS 18.2 or above.

🔧 What You’ll Need

P2 Pentalobe screwdriver (0.8 mm)
Y000 Tri-point screwdriver (0.6 mm)
Polar Tech Magic Self-Heating Pad

Opening picks
Isopropyl alcohol
Plastic spudger
Polar Tech OEM battery

⚙️ Step-by-Step Battery Replacement Guide

1. Turn Off the Phone and remove Bottom Screws

Always power off your iPhone before disassembly.

Using a P2 Pentalobe screwdriver, remove the two screws next to the lightning port.

2. Heat the Screen

Use the Polar Tech Magic Self-Heating Pad for 10 minutes to soften the adhesive.

3. Open the Screen

Insert a thin metal blade to gently lift the screen edge. Drop a bit of isopropyl alcohol to reduce glue stickiness. Once a gap opens, switch to a plastic pick to separate the screen all around.

⚠️ Important: Flip the screen from the right side gently to avoid damaging the display cable.

4. Remove the Shield Plate

Unscrew the eight Tri-point screws (Y000) and carefully remove the shield.

5. Disconnect Battery First

Unplug the battery connector (BTB) before any other connectors. Then unplug all other connectors – avoid touching the Face ID area.

6. Remove the Old Battery

Use alcohol to weaken the adhesive under the battery. Gently pry from the edges — do not puncture or bend the battery, as it can catch fire.

7. Install New Polar Tech Battery

Place the new battery, which already includes fresh adhesive. Reconnect the battery BTB first to help pre-bend the battery cable properly.

✅ Battery Calibration – No More “Not Recognised” Errors

After reassembly (without sealing the screen fully), follow these steps to complete battery calibration:

Go to Settings – you may see Battery Not Recognized.
Tap Restart & Finish Repair.
Keep the device connected to Wi-Fi.
Tap Continue, then Agree, then Restart.
The phone will reboot and calibrate the battery with Apple’s system.
After restart, battery health should display correctly — just like original.

📌 This battery passes Apple’s internal verification process.

🔚 Final Steps

Fully reinstall the screen
Reinsert the bottom two Pentalobe screws
For better screen seal, reheat with the Polar Tech heating pad for 20 minutes