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Apple iPhone X Replacement Battery 616-00351 3150mAh

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Fits Apple iPhone X with OEM part number 616-00351 battery replacement.
3.82V and 3150mAh capacity restores full charge cycles on the X platform.
Connector clips to the flex cable with single-point locking tab; orientation keyed.
We ran full discharge-to-cutoff on bench; BMS discharged cleanly to 2.5V floor.
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.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

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⚠️ 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

3.82V

Amp

3150mAh

Apple iPhone X — 3.82V Li-Polymer Replacement Battery (616-00351)

This 3.82V, 3150mAh (12.03Wh) Li-Polymer battery is a direct cell replacement for the Apple iPhone X. It fits all iPhone X variants, including MQA62LL/A, MQA92LL/A, and MQA82LL/A. The OEM part number is 616-00351, matching Apple's original specification for this device.

  • iPhone X compatibility: All iPhone X variants share the same battery bay geometry, connector pinout, and BMS handshake protocol. The 616-00351 cell format and voltage rail are consistent across every regional SKU of this model.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on an iPhone X unit. The BMS accepted the cell without error flags, fuel gauge IC synced after one full cycle, and charge IC negotiation completed normally under both standard and fast charge protocols.
  • First-cycle fast charge tip: 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's discharge curve before high-current fast charging pushes current into an uncalibrated cell.

Why the iPhone X reports wrong battery percentage after a cell swap

The iPhone X uses a coulomb counter inside the power management IC to track state of charge. That counter was calibrated to the original cell's discharge curve over hundreds of cycles. A new cell has a different internal resistance profile, so the counter's reference points are off from the start. The fix is one full discharge to automatic shutoff followed by a complete charge to 100% — this resets the fuel gauge's anchor points against the new cell.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens because the fuel gauge IC still references the old cell's voltage-to-capacity curve. At high load — modem transmitting, screen at full brightness — the new cell's voltage briefly dips below the shutdown threshold even though capacity remains. The power management IC reads that as a critically low cell and cuts power. Run one full calibration cycle first, then check if shutdowns persist; if they do, verify the battery connector is fully seated, as a loose contact raises contact resistance and amplifies voltage sag under load.

Compatible Models

iPhone X MQA62LL/A MQA92LL/A MQA82LL/A MQA52LL/A

Replaces Part Numbers

616-00351

Technical Specifications

Voltage3.82V
Amp Hours3150mAh
Capacity3150mAh
Rate12.03Wh
Net Weight50g /1.76 oz
Gross Weight100g /3.53 oz
Approximate Weight100g /3.53 oz
Dimension 96.50 x 57.20 x 4.22mm

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 X shows 100% then drops to 80% within minutes — is the percentage readout broken or is the cell bad?

The percentage readout is not broken — the fuel gauge IC is running against a discharge curve calibrated to the old cell. A new 616-00351 cell has different impedance characteristics, so the coulomb counter loses accuracy until it has a reference point. Run one complete discharge to automatic shutoff and then charge uninterrupted to 100% without fast charging enabled. After that cycle, the percentage reporting stabilises against the new cell's actual curve.

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

The USB-PD handshake on the first cycle after a cell replacement can default to standard charge mode because the BMS presents higher impedance on a fresh, uncalibrated cell. The charge IC reads that as an unsafe condition and drops current. Plug into an Apple-certified USB-PD adapter, let the phone charge fully at whatever rate it accepts, then unplug and replug — on the second connection the BMS typically negotiates fast charge correctly once the cell has been partially conditioned.

The iPhone X will not power on at all after the replacement battery sat in a drawer for several months before installation.

A Li-Polymer cell stored uncharged for an extended period can drop below 2.5V per cell, which triggers BMS lockout — the protection circuit opens and blocks current flow to prevent damage. Connect the phone to a low-current charger (a standard 5W USB-A adapter works better here than a fast charger) and leave it for 20–30 minutes without pressing the power button. The charge IC will trickle voltage into the cell until it crosses the BMS recovery threshold, at which point the screen will show the low-battery icon and normal boot becomes possible.

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