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Apple iPhone 14 Replacement Battery A2863 3.87V 3250mAh

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From $43.99 USD $54.99
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Fits Apple iPhone 14, replaces OEM battery part number A2863.
3.87V at 3250mAh capacity delivers the same energy as factory cells before degradation sets in.
Connector seats flush into the battery slot with no adapter needed; adhesive strips secure the pack against the case wall.
We ran full discharge cycles on an iPhone 14 motherboard—the BMS accepted charge without delay and voltage stayed stable under processor load.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against the new cell discharge curve before high-current charging resumes.
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

3.87V

Amp

3250mAh

Apple iPhone 14 — 3.87V Li-Polymer Replacement Battery (A2863)

This is a 3250mAh, 3.87V Li-Polymer cell for the Apple iPhone 14. It replaces part number A2863 — the original cell Apple installs at the factory. Fits the iPhone 14 standard model only, not the Plus, Pro, or Pro Max.

  • iPhone 14 cell compatibility: The iPhone 14 uses a specific connector pinout and BMS handshake tied to Apple's fuel gauge IC. A2863-format cells carry the correct contact layout and charge profile so the device accepts the cell without throwing a non-genuine battery warning on the first boot.
  • Bench tested on actual hardware: We ran this cell in an iPhone 14 on the bench. The BMS accepted the charge handshake from a USB-PD 20W adapter, the fuel gauge IC initialised correctly at first power-on, and the charge IC held the expected 4.35V termination voltage without triggering overvoltage protection.
  • Fuel gauge recalibration after installation: After fitting this cell, disable fast charging for the first complete discharge-charge cycle. The fuel gauge IC is still calibrated to your old cell's discharge curve. One slow cycle at standard 5W lets the coulomb counter map the new cell before fast charging pushes high current into an uncalibrated state of charge reading.

Sudden shutdown at 20–30% on the iPhone 14 after a cell swap

This is a voltage cliff problem, not a capacity problem. Under modem or display load, the cell voltage drops faster than the fuel gauge IC predicts — the phone sees the rail fall below the shutdown threshold before the percentage reading catches up. It trips the emergency cutoff and the phone goes dark. The fix is one full slow discharge to 0% followed by a complete charge to 100% at 5W standard speed. That single cycle gives the coulomb counter enough data to remap the discharge curve and close the gap between reported percentage and actual cell voltage.

iPhone 14 not powering on after the replacement cell sat in storage

Li-Polymer cells self-discharge in storage. If this cell shipped below 2.5V per cell — or your phone sat unused for months after fitting — the BMS may have entered lockout to prevent a deep-discharge fault. The phone will not respond to the power button and will show nothing on screen. Connect a 5W charger and leave it for 20–30 minutes before attempting to power on. If the Apple logo appears at any point during that window, the BMS has cleared the lockout and normal charging has resumed. If no logo appears after 45 minutes, check the charge cable and adapter are delivering at least 5V 1A to the port.

Compatible Models

iPhone 14

Replaces Part Numbers

A2863

Technical Specifications

Voltage3.87V
Amp Hours3250mAh
Capacity3250mAh
Rate12.58Wh
Net Weight45g /1.59 oz
Gross Weight95g /3.35 oz
Approximate Weight95g /3.35 oz
Dimension 88.60 x 44.30 x 5.00mm

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

Why does my iPhone 14 show the wrong battery percentage after fitting the new cell?

The fuel gauge IC inside the iPhone 14 builds a discharge model from hundreds of charge cycles on the original cell. Swap the cell and that model no longer matches the new cell's actual voltage curve, so the percentage reading drifts from reality. Run one complete discharge to 0% and one full charge to 100% at standard 5W speed — no fast charging during this cycle. After that single cycle, the coulomb counter has enough real data to recalibrate against the new A2863 cell and percentage accuracy returns.

Fast charging stopped working the first time I plugged in after replacing the battery — what happened?

On the first connection after a cell swap, the USB-PD negotiation sometimes fails because the charge IC is still stepping through its initialisation sequence with the new BMS. The adapter drops back to 5W standard charging as a fallback. Disconnect the cable, wait 10 seconds, and reconnect. If fast charging still does not engage, do one full standard-speed charge cycle first — the BMS needs to complete one full charge pass before it consistently accepts the 20W USB-PD handshake on subsequent connections.

My iPhone 14 gets noticeably warm near the back during the first few charges after the swap — is that normal?

A new Li-Polymer cell starts with higher internal impedance than a cell that has been cycled. The charge IC pushes current into a higher-resistance load during those first cycles, which generates more heat than you would see on a broken-in cell. The warmth should drop off after three to five full charge cycles as the cell's impedance settles. If the phone becomes hot to the touch — not just warm — or if charging stops and restarts repeatedly, check that the replacement cell connector is fully seated, as a partial connection raises contact resistance and worsens heating.

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