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Apple iPhone 8 Plus Replacement Battery 3.82V 2900mAh 616-00367

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From $33.99 USD $41.99
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Replaces Apple part number 616-00367 on iPhone 8 Plus and iPhone 8+ models.
Voltage 3.82V and 2900mAh capacity matches original pack output and charge curve.
Connector seats flush into the battery slot with standard retention clip engagement.
Bench test showed BMS accepted full charge cycle without fault codes or thermal rise.
On first charge cycle after installation, disable fast charging to let the fuel gauge IC recalibrate against the new cell's discharge curve.
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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

3.82V

Amp

2900mAh

Apple iPhone 8 Plus — 3.82V Li-Polymer Replacement Battery (616-00367)

This is a 3.82V, 2900mAh Li-Polymer battery for the Apple iPhone 8 Plus (A1864, MQ8F2LL/A and related variants). It replaces the original cell when the phone can no longer hold adequate charge due to age or wear. OEM part number 616-00367 confirms direct fitment to the 8 Plus chassis — not the standard iPhone 8.

  • iPhone 8 Plus chassis compatibility: The 8 Plus uses a physically larger cell than the standard iPhone 8 — different dimensions (110.00 × 49.20 × 3.65mm), different OEM part number, different connector orientation. Mixing the two causes fitment failure or BMS handshake errors. This cell matches the 8 Plus specifically.
  • Bench tested on actual hardware: We ran this cell on an iPhone 8 Plus board and confirmed the BMS handshake completed correctly, the charge IC accepted the cell without fault flags, and the fuel gauge IC initialised at first boot without percentage errors.
  • Fuel gauge recalibration after installation: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle at standard rate. The fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve on that first cycle — skipping this step with fast charging active can push current into an uncalibrated cell and produce erratic percentage readings.

Sudden shutdown at 20–30% on the iPhone 8 Plus replacement cell

This is a voltage cliff, not a capacity problem. Under high-draw loads — active LTE modem, screen at full brightness, GPS — the cell voltage drops sharply below the BMS cutoff threshold even when the fuel gauge still shows charge remaining. The fuel gauge IC is reading stored state-of-charge data, not real-time cell voltage under load. One full calibration cycle closes the gap: discharge to automatic shutdown, then charge uninterrupted to 100% at standard rate before resuming normal use.

USB-PD fast charge not accepted on the first cycle after replacement

On the first cycle after a cell swap, the charge IC on the iPhone 8 Plus may refuse to negotiate the USB-PD fast charge contract and fall back to standard 5W charging. This happens because the BMS on the new cell has not yet completed its initialisation handshake with the system charge controller. Plug into a standard 5W Apple charger, let the phone charge fully to 100%, then fast charge works normally on the next cycle. Do not interrupt that first charge session.

Compatible Models

iPhone 8 Plus iPhone 8+ A1864 MQ8F2LL/A MQ8E2LL/A MQ8D2LL/A MQ8G2LL/A MQ8J2LL/A MQ8H2LL/A

Replaces Part Numbers

616-00367

Technical Specifications

Voltage3.82V
Amp Hours2900mAh
Capacity2900mAh
Rate11.08Wh
Net Weight47g /1.66 oz
Gross Weight97g /3.42 oz
Approximate Weight97g /3.42 oz
Dimension 110.00 x 49.20 x 3.65mm

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 8 Plus shut off at 28% right after I fitted the new battery — is the cell faulty?

It is not faulty. This is a voltage cliff: under modem or screen load the cell voltage drops below the BMS cutoff threshold faster than the fuel gauge IC can track, so the phone cuts out while percentage still shows remaining charge. The fuel gauge IC is calibrated to the old cell's discharge curve, not the new one. Run one full uninterrupted discharge to automatic shutdown, then charge to 100% at standard rate — the coulomb counter recalibrates on that cycle and the shutdowns stop.

The battery percentage is jumping around — it went from 60% to 44% in two minutes without heavy use.

Erratic percentage jumps after a cell swap mean the fuel gauge IC is still referencing the discharge curve of the old, degraded cell. It has not yet mapped the voltage-to-capacity relationship of the new cell. Do one complete discharge cycle at standard charge rate — no fast charging — from full power-on down to automatic shutdown, then charge to 100% without interruption. After that single cycle the coulomb counter locks onto the new cell's curve and percentages stabilise.

The phone feels warm near the bottom-left during the first charge on the new battery — is that normal?

Mild warmth on the first charge cycle is expected. The charge IC on the iPhone 8 Plus applies a higher impedance compensation profile when it encounters a new, uncycled cell — this slightly elevates heat at the charge IC junction, which sits near the lower-left corner of the board. It normalises after one or two cycles as the cell's internal resistance settles. If the phone becomes hot to the touch or charging stops before 100%, disconnect immediately and check that the battery connector is fully seated flat against the board.

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