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Apple iPhone 8 Plus Replacement Battery 616-00367 3.82V 2690mAh

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Fits Apple iPhone 8 Plus with OEM part number 616-00367 replacement.
3.82V nominal, 2690mAh capacity restores full charge cycles on aged packs.
Adhesive strip secures cell flat against frame; connector seats parallel to logic board.
Bench test showed BMS accepted charge curve on first insertion; no fault codes.
On first full charge cycle after installation, disable fast charging to let the fuel gauge IC recalibrate against the new cell 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.

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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

2690mAh

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

This is a 3.82V, 2690mAh Li-Polymer replacement battery for the Apple iPhone 8 Plus (models A1864, MQ8F2LL/A, and compatible variants). It replaces the original cell when the device shows shortened battery life, unexpected shutdowns, or refuses to hold a charge. Capacity is 2690mAh (10.28Wh), matching the OEM specification under OEM part number 616-00367.

  • iPhone 8 Plus model coverage: The A1864, A1897, A1898 variants all share the same battery connector, voltage rail, and BMS handshake protocol. One cell fits all three because Apple did not change the battery interface across regional SKUs of this generation.
  • Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an iPhone 8 Plus logic board. The BMS completed authentication handshake without error, and the charge IC accepted current at the expected 5V/2A USB-PD rate after the first full cycle.
  • First-cycle calibration tip: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter.

Why the iPhone 8 Plus reports wrong battery percentage after a cell swap

The iPhone 8 Plus uses a coulomb counter tied to the PMU (power management unit) that retains calibration data from the old cell. When a new cell goes in, the stored discharge curve no longer matches the new cell's actual voltage-to-capacity relationship. The PMU reports percentage based on stale data until it can observe a full discharge and charge cycle on the new cell. After one complete cycle from 100% down to automatic shutdown and back to 100%, the fuel gauge recalibrates and percentage readings stabilise.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity problem. Under heavy load — active LTE modem, screen at full brightness, or GPS — the replacement cell's terminal voltage drops sharply before the reported state of charge reaches zero. The PMU reads that voltage drop as a critical threshold breach and cuts power to protect the board. It happens because the fuel gauge IC is still calibrated to the old cell. Run one full discharge cycle to let the PMU learn the new cell's voltage sag profile, and the cutoff point will shift back toward 0%.

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 Hours2690mAh
Capacity2690mAh
Rate10.28Wh
Net Weight44g /1.55 oz
Gross Weight94g /3.32 oz
Approximate Weight94g /3.32 oz
Dimension 108.80 x 49.30 x 3.28mm

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

It's almost certainly a BMS lockout, not a dead cell. When a Li-Polymer cell drops below roughly 2.5V during long storage, the battery management system trips a low-voltage protection cutoff and blocks output entirely. Plug the phone into a wall charger — not a USB port — and leave it for 20–30 minutes without pressing the power button. If the BMS recovery circuit is functioning, the cell will trickle-charge back above the lockout threshold and the phone will boot normally.

Fast charging stopped working after I installed a replacement battery — the phone only charges slowly now.

On the first cycle after a cell swap, the charge IC sometimes defaults to standard 5W charging while the BMS exchanges authentication data with the PMU. We saw this on the bench — USB-PD fast charge negotiation failed on cycle one and resolved on cycle two without any intervention. Complete one full standard charge to 100%, then reconnect a USB-PD-capable charger and fast charging should resume. If it doesn't, check that the battery connector is fully seated, as a partially engaged ZIF connector breaks the BMS communication line.

The battery percentage on my iPhone 8 Plus jumps around erratically — it reads 45%, then skips to 60%, then drops back.

Erratic percentage jumps mean the fuel gauge IC is actively recalibrating against a cell it has never seen before. The coulomb counter is interpolating from an old discharge curve that no longer matches the new cell's actual behaviour, so it corrects itself in visible steps as it gathers new data points. This resolves after one or two complete discharge-charge cycles — discharge until the phone shuts off automatically, then charge uninterrupted to 100%. After two cycles the percentage readings will track smoothly.

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