Étiquette : message important sur la batterie

iPhone 12 Pro battery replacement is more than a simple cell swap. This model uses an encrypted battery protection board, so aftermarket installs usually need a BMS transfer, data rewrite, and a tag-on flex. Genuine Apple batteries follow a different path with Apple Service Toolkit 2 (AST2).

This guide walks through when to replace, what it typically costs, the shop method vs Apple parts, and how to clear the “Unable to verify this iPhone has a genuine Apple battery” alert. It is written for repair shops and advanced DIY techs who already work with heat, adhesive, and small connectors.

Example device: iPhone 12 Pro
Santé de la batterie : 87% (Settings → Battery → Battery Health → Maximum Capacity)

When to replace an iPhone 12 Pro battery

Apple designs iPhone batteries (14 and earlier, including the 12 Pro) to retain about 80% capacity at 500 complete charge cycles under ideal conditions. Many techs still quote a swap near or below 80%, or when Battery Health shows a Service recommendation. Customers sometimes request a replacement earlier (for example at 85-90%) to restore full-day runtime. That is a preference call, not a hard Apple rule.

In the example above, health sits at 87%. A replacement can still make sense if the customer wants better runtime, or if the phone shows unexpected shutdowns, heat while charging, or peak performance messages.

Cost and battery specs (quick reference)

Prices vary by country, tax, and part grade. Use these U.S.-oriented figures as a planning baseline, then confirm local quotes:

• Apple / AppleCare+ service: about $89 out of warranty for iPhone 12 / 12 Pro battery service (AppleCare+ is often no extra charge when capacity is below 80%). Always re-check Apple’s current estimate tool.
• Independent shop: often about $50-$100+ depending on city, warranty, and whether the shop transfers the BMS or uses AST2.
• DIY / wholesale cell: kits often land around $40-$60 retail; shop wholesale cells can undercut that.

Capacity reference (teardown consensus, not an Apple datasheet line): about 2,815 mAh (~10.78 Wh at 3.83 V). Common part marking refs include A2479 (also seen as styles like 11CP5/45/85 on replacement listings). iPhone 12 and 12 Pro share the same capacity class; 12 Pro Max does not.

How to replace an iPhone 12 Pro battery

1. Battery protection board encryption (aftermarket path)

The iPhone 12 Pro uses an encrypted battery protection board. Dropping in a raw aftermarket cell without handling the board and data is how shops get a permanent Important Battery Message and missing health percentage.

Transfer the protection board: Carefully remove the old pack, separate the original BMS / protection board, and spot-weld that board onto the new cell tabs with a proper fixture. Use a machine à souder (or equivalent laser / resistance welder). Align anode and cathode correctly, then insulate with the correct tape and bracket.

2. Rewrite battery data

Models before 2018: A battery programmer rewrite was often enough.

XS and later (including iPhone 12 Pro): After board transfer and data rewrite with a programmeur, attach a tag-on flex when you change cell data so authentication does not leave a permanent alert.

Remarque : Skip these steps and you will usually see “Unable to verify this iPhone has a genuine Apple battery” after power-on.

3. Official Apple battery + AST2

For genuine Apple parts, keep the phone on Wi-Fi and use Apple Service Toolkit 2 (AST2):

Apple Service Toolkit 2 (AST2) :

• Connectez-vous à AST2.
• Enter the battery serial number and run diagnostics on the phone.
• After diagnostics clear, proceed with the battery install.

4. Remove the old battery

• Open the display safely; do not crease flexes.
• Disconnect the battery connector, then remove the original pack with adhesive pull tabs or isopropyl. Never lever hard under a swollen cell.
• Apply new waterproof frame adhesive. It restores a seal; it does not magically restore factory IP68 rating.

5. Install the new battery

• Seat the new Batterie de l'iPhone 12 Pro (or your shop cell with transferred BMS).
• Reconnect the battery connector, reassemble the display, and power on.
• Verify charge, Battery Health visibility, and that the phone boots cleanly under load.

6. Clear the genuine battery alert

• Initial alert: On first power-up you may see “Unable to verify this iPhone has a genuine Apple battery.”
• Genuine Apple path: Log back into AST2 and run diagnostics again to clear the non-original alert.
• Aftermarket path: Confirm BMS transfer, programmer write, and tag-on flex were done correctly. Persistent alerts usually mean a skipped auth step.

Watch how to clear Important Battery Message pop-ups on iPhone XS through 12 Pro Max:

Questions fréquemment posées

Wrap-up

A clean iPhone 12 Pro battery replacement means picking the right path: aftermarket (BMS transfer + programmer + tag-on) or genuine Apple (AST2 diagnostics). Keep adhesives fresh, never force a swollen cell, and verify auth and health on first boot so you avoid callbacks.

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