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Apple iPhone 14 Pro A2866 Compatible Battery 3.87V 3200mAh

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From $50.99 USD $62.99
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Fits Apple iPhone 14 Pro, replaces OEM battery part number A2866.
3.87V, 3200mAh lithium-polymer cell restores full charge cycles on devices that shut down prematurely or report inaccurate percentage.
Connector type is standard Apple internal flex, 79.30 x 60.10 x 5.20mm form factor, seats flush against the midframe without adhesive rework.
We bench-tested this cell on an iPhone 14 Pro logic board — the BMS accepted the new fuel gauge handshake on first power cycle with no error codes.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this lets the fuel gauge IC recalibrate against the new cell discharge curve before USB-PD pushes current into an uncalibrated cell.
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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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

3.87V

Amp

3200mAh

Apple iPhone 14 Pro — 3.87V Li-Polymer Replacement Battery (A2866)

This 3.87V, 3200mAh Li-Polymer cell replaces the original A2866 battery inside the iPhone 14 Pro. It fits the 14 Pro only — not the standard 14, 14 Plus, or 14 Pro Max, which each run different cell dimensions and BMS configurations. Capacity is rated at 12.38Wh.

  • iPhone 14 Pro fit: The 14 Pro uses a unique cell footprint — 79.30 × 60.10 × 5.20mm — with a dedicated flex connector and BMS handshake tied to Apple's battery health reporting system. This cell matches that physical and electrical spec exactly.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a 14 Pro unit. The BMS accepted the cell without error flags, and charge current stepped down correctly at each voltage threshold through the CC/CV charging stages.
  • Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC build an accurate coulomb-count profile against the new cell's discharge curve before high-current charging is introduced.

Why the iPhone 14 Pro reports wrong battery percentage after a cell swap

Apple's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell chemistry, so the reported percentage drifts from the real state of charge. The IC needs a full discharge and charge cycle to recalibrate its coulomb counter against the replacement cell. Until that cycle completes, the percentage reading can appear several points off in either direction — this is expected behaviour, not a fault in the cell itself.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still running the old cell's discharge curve and misjudges the new cell's voltage cliff. Under heavy load — 5G modem activation or sustained screen brightness — the cell voltage drops faster than the IC predicts, and the phone cuts out before percentage hits zero. One full calibration cycle resolves it in most cases. If shutdowns continue after calibration, check that resting cell voltage holds above 3.80V after a full charge.

Compatible Models

iPhone 14 Pro

Replaces Part Numbers

A2866

Technical Specifications

Voltage3.87V
Amp Hours3200mAh
Capacity3200mAh
Rate12.38Wh
Net Weight44g /1.55 oz
Gross Weight94g /3.32 oz
Approximate Weight94g /3.32 oz
Dimension 79.30 x 60.10 x 5.20mm

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 14 Pro shows 100% charge but shuts down randomly — is that the new battery or a software problem?

That's the fuel gauge IC running the discharge profile it learned from the old cell. The new A2866 cell has a slightly different voltage curve, so the IC misjudges the remaining charge and cuts power before the percentage reaches zero. Run one full discharge down to automatic shutdown, then charge uninterrupted to 100% without fast charging enabled. After that cycle, the coulomb counter recalibrates and erratic shutdowns typically stop.

Fast charging stopped working after I replaced the battery — the phone only trickle charges now.

On the first cycle after a cell swap, the charge IC can default to a low-current safe-charge mode while it verifies the new cell's internal resistance and BMS response. This is a one-cycle behaviour. Plug into a USB-PD-certified 20W adapter and let the phone charge to 100% without interruption — on the next charge session, the IC should negotiate full fast-charge current. If fast charging still fails to engage, check that the flex connector is fully seated, as a partial connection interrupts the BMS communication line.

The iPhone 14 Pro won't turn on at all after the replacement battery sat in storage for a few weeks before installation.

Li-Polymer cells self-discharge in storage, and if the A2866 cell dropped below approximately 2.5V before installation, the BMS enters a lockout state to prevent charging a dangerously depleted cell. Connect the phone to a genuine Apple or MFi-certified USB-PD charger and leave it for 20–30 minutes without pressing any buttons — the BMS recovery circuit trickle-charges the cell up to a safe threshold before allowing normal boot. Once the Apple logo appears, let it charge to at least 20% before using the device.

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