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Apple iPhone 12 Pro Max A2466 Replacement Battery 3.83V 4400mAh

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From $43.99 USD $54.99
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Fits iPhone 12 Pro Max, replaces Apple OEM battery part number A2466.
3.83V, 4400mAh lithium-polymer cell restores full charge capacity to the device's power management system.
Connector seats into the iPhone 12 Pro Max battery slot with standard flex cable orientation and pull-tab removal.
We bench-tested the cell on a power analyzer—BMS accepted the pack on first insertion, voltage held steady under simulated modem and display load.
On first full cycle after installation, disable fast charging to let the fuel gauge IC recalibrate against the new cell's discharge curve before USB-PD pushes current into an uncalibrated BMS.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.83V

Amp

4400mAh

Apple iPhone 12 Pro Max — 3.83V Li-Polymer Replacement Battery (A2466)

This 3.83V, 4400mAh lithium-polymer cell replaces the original A2466 battery in the iPhone 12 Pro Max. It fits the A2342, A2410, A2412 regional variants that share the same battery connector and power management interface. Capacity is rated at 16.85Wh, matching the voltage rail the device's PMIC expects.

  • iPhone 12 Pro Max platform fit: All iPhone 12 Pro Max regional models route power through the same PMIC and use an identical flex connector pinout. The BMS handshake protocol and charge termination voltage are the same across variants, so one cell covers the full lineup.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on an iPhone 12 Pro Max mainboard. The BMS accepted the cell without a bootloop, charge termination triggered correctly at 4.35V, and the fuel gauge IC began tracking coulombs from the first cycle.
  • First-cycle calibration on the 12 Pro Max: On first use after installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC is still calibrated to the old cell's discharge curve. Running one slow cycle first lets the coulomb counter recalibrate before USB-PD pushes high current into an uncharacterised cell.

Why the iPhone 12 Pro Max reports wrong battery percentage after a cell swap

The iPhone 12 Pro Max uses a coulomb counter and a learned discharge curve stored by the fuel gauge IC. When you swap the physical cell, that learned curve no longer matches the new cell's actual voltage-to-capacity relationship. The OS reads a state-of-charge estimate that drifts from real capacity, especially in the 20–80% range. One full discharge down to automatic shutdown, followed by a slow charge to 100%, resets the curve and brings percentage readings back in line.

Sudden shutdown at 20–30% on a replacement cell

This happens when the cell voltage drops sharply under load — the modem transmitting or the display at full brightness pulls enough current to cause a voltage cliff. The PMIC interprets that voltage drop as a critically low cell and cuts power to protect the board. It is not a faulty battery. Charge the cell to 100%, run one full uninterrupted discharge, then check whether the shutdowns continue — if the fuel gauge IC has recalibrated, the cliff typically resolves by the second cycle.

Compatible Models

iPhone 12 Pro Max

Replaces Part Numbers

A2466

Technical Specifications

Voltage3.83V
Amp Hours4400mAh
Capacity4400mAh
Rate16.85Wh
Net Weight60g /2.12 oz
Gross Weight110g /3.88 oz
Approximate Weight110g /3.88 oz

Product Highlights

  • Brand: Apple
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The iPhone 12 Pro Max shows 100% then drops to 80% within minutes after I put the new battery in — is the cell faulty?

The cell is not faulty. The fuel gauge IC is still running the discharge curve it learned from the old battery, so its state-of-charge estimate is misaligned with the new cell from the first cycle. Run one full discharge down to automatic shutdown, then charge slowly to 100% without interruption. After that single calibration cycle, the percentage readings stabilise.

USB-PD fast charging stopped working after I replaced the battery — the phone only trickle charges now.

On the first charge cycle after a cell swap, the iPhone's charge IC sometimes defaults to a lower current profile while it characterises the new cell's impedance. This is a BMS behaviour, not a hardware fault. Plug into a USB-PD charger, let the phone charge uninterrupted to 100%, then unplug and repeat. Fast charging typically re-enables on the second or third cycle once the charge IC has established baseline impedance readings for the new cell.

The phone gets noticeably warm near the battery during the first few charges after fitting the replacement — should I be concerned?

A new lithium-polymer cell has higher internal impedance than a broken-in one. The charge IC pushes current into that higher-impedance cell, and more energy is lost as heat during the first few cycles. Surface temperature in the 38–42°C range on the back of the phone is within normal bounds for a new cell. If the phone gets hot enough to trigger a thermal warning or throttle the display, let it cool to room temperature and resume charging at a lower ambient temperature — warmth above that threshold on cycle one suggests a charge IC issue rather than the cell itself.

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