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Apple iPhone 13 Pro A2656 Replacement Battery 3.85V 3000mAh

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From $39.99 USD $49.99
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Fits Apple iPhone 13 Pro (A2656) and A2640 variant, replaces original battery part A2656.
This cell delivers 3.85V at 3000mAh (11.55Wh) using Li-Polymer chemistry for processor, display, and modem power.
Connector seats flush into the battery cavity with a single mechanical locking tab; orientation is keyed.
We ran a full discharge cycle on a bench unit — the BMS held steady voltage under mixed load with no early cutoff.
On first use after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge IC recalibrate against the new cell curve before USB-PD protocol engages the charging IC.
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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

3.85V

Amp

3000mAh

Apple iPhone 13 Pro — 3.85V Li-Polymer Replacement Battery (A2656)

This 3.85V, 3000mAh (11.55Wh) Li-Polymer cell is a direct replacement for the Apple iPhone 13 Pro (A2656). It fits the iPhone 13 Pro and iPhone 13 Pro 5G (A2640). Install it when the original cell has degraded past the point where iOS Battery Health flags service needed.

  • iPhone 13 Pro and 13 Pro 5G fit: Both variants share the same battery bay geometry, connector pinout, and BMS handshake protocol — the A2656 part number covers both. No adapter or modification required at the connector.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on an iPhone 13 Pro unit. The BMS accepted the cell without error flags, and the charge IC stepped through trickle, CC, and CV phases correctly to termination.
  • Fuel gauge recalibration on first install: Disable fast charging for the first complete discharge-charge cycle after installation. This allows the coulomb counter to map the new cell's discharge curve before high-current USB-PD charging begins. Skipping this step causes the percentage readout to drift for the first several cycles.

Why the iPhone 13 Pro reports wrong battery percentage after a cell swap

The fuel gauge IC on the iPhone 13 Pro uses a coulomb counter calibrated to the original cell's charge curve. When a new cell goes in, that curve no longer matches what the IC expects. The gauge reads voltage-based estimates until a full cycle teaches it the new cell's actual discharge profile. One complete discharge to automatic shutdown followed by an uninterrupted charge to 100% resets the learning algorithm and brings percentage accuracy back in line.

Sudden shutdown at 20–30% on the replacement cell

This happens when the replacement cell cannot sustain voltage under high-current loads — typically the 5G modem or ProMotion display ramping together. The cell voltage drops below the BMS cutoff threshold even though the fuel gauge still shows charge remaining. It is not a defective cell — it is an uncalibrated gauge hitting a real voltage cliff. Run one full discharge cycle without fast charge, and confirm the shutdown threshold moves below 15% before routine use.

Compatible Models

iPhone 13 Pro iPhone 13 Pro 5G A2640

Replaces Part Numbers

A2656

Technical Specifications

Voltage3.85V
Amp Hours3000mAh
Capacity3000mAh
Rate11.55Wh
Net Weight43g /1.52 oz
Gross Weight93g /3.28 oz
Approximate Weight93g /3.28 oz
Dimension 77.20 x 61.00 x 4.80mm

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

My iPhone 13 Pro won't turn on at all after sitting in a drawer for months — is the new battery dead?

The BMS locks the cell out when voltage drops below approximately 2.5V per cell during extended storage. Connect to a charger and leave it for 20–30 minutes without attempting to power on — the charge IC runs a trickle charge phase to bring the cell above the BMS recovery threshold before normal charging starts. If the Apple logo does not appear within 45 minutes on a known-working cable and adapter, check that the battery connector is fully seated on the logic board.

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

USB-PD negotiation between the charge IC and a new BMS can fail on the first cycle because the IC does not yet recognise the cell's internal resistance profile. Disconnect the charger, power the phone off completely, then reconnect to a USB-PD adapter. If fast charge still does not engage, complete one full standard charge cycle — the charge IC recalibrates its current limits on the second cycle and USB-PD handshake typically resumes normally.

The battery percentage jumps around erratically — it drops from 60% to 30% in minutes, then recovers.

Erratic percentage jumps are a coulomb counter problem, not a cell capacity problem. The fuel gauge IC is still using the discharge curve from the old cell, so its voltage-to-percentage mapping is wrong at mid-range. Run one complete discharge — let the phone shut off on its own — then charge uninterrupted to 100% without removing the charger. After that single calibration cycle, the gauge maps the new cell's curve and the percentage readout stabilises.

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