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Apple iPhone 11 Compatible Battery 3.83V 3100mAh 616-00641

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Fits Apple iPhone 11 models A2111 and A2221, replacing OEM part number 616-00641.
Voltage 3.83V and 3100mAh capacity restore full daily runtime on the iPhone 11 fuel gauge IC.
Flex connector attaches to the logic board socket with a single pull-tab — no locking mechanism required.
We tested the cell on bench with iPhone 11 diagnostics; BMS accepted charge handshake on first insertion without fault codes.
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 USB-PD pushes current into an uncalibrated cell.
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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.

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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

3.83V

Amp

3100mAh

Apple iPhone 11 — 3.83V Li-Polymer Replacement Battery (616-00641)

This 3.83V Li-Polymer battery delivers 3100mAh (11.87Wh) of capacity for the iPhone 11, covering model variants A2111 and A2221. It replaces the original 616-00641 cell when capacity has degraded through normal chemical aging. Fit is direct — same dimensions at 100.90 × 44.60 × 4.40mm and the same connector layout as the OEM unit.

  • A2111 and A2221 coverage: Both variants run the same power architecture, voltage rail, and BMS handshake protocol, so one cell covers the full iPhone 11 lineup regardless of regional SKU differences.
  • Bench tested on actual hardware: We cycled this cell on an iPhone 11 mainboard and confirmed the BMS handshake completed correctly, charge IC accepted the cell without flagging a service warning, and capacity reporting settled within the first full cycle.
  • First-cycle fuel gauge calibration: After installation, disable fast charging and complete one full discharge-to-charge cycle at standard 5W. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the iPhone 11 reports wrong battery percentage after a cell swap

The iPhone 11 uses a coulomb counter and fuel gauge IC that calibrates its percentage model against the previous cell's discharge curve. When a new cell goes in, that curve no longer matches the stored data. The result is percentage readings that jump, stall, or report full charge well before the cell is actually topped up. One complete discharge-to-zero followed by an uninterrupted charge to 100% resets the calibration baseline and brings percentage reporting back into line.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under high-draw conditions — modem activity, GPS, or screen-on workloads — the new cell's voltage drops briefly below the hardware cutoff threshold even though the displayed percentage suggests capacity remains. The phone reads this as a voltage cliff and shuts down as a protection measure. Run one full discharge cycle without fast charging to let the coulomb counter recalibrate against the actual cell chemistry, then verify the shutdown no longer occurs below 3.50V on the next discharge.

Compatible Models

iPhone 11 A2111 A2221

Replaces Part Numbers

616-00641

Technical Specifications

Voltage3.83V
Amp Hours3100mAh
Capacity3100mAh
Rate11.87Wh
Net Weight44g /1.55 oz
Gross Weight94g /3.32 oz
Approximate Weight94g /3.32 oz
Dimension 100.90 x 44.60 x 4.40mm

Product Highlights

  • Brand: Apple
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My iPhone 11 powers off around 25% but the battery percentage looked fine — why does this happen with a new cell?

The fuel gauge IC on the iPhone 11 calibrated its voltage-to-percentage curve against your old degraded cell, not the new one. Under modem or screen load the new cell's voltage dips briefly below the shutdown threshold, which the phone reads as a hard cutoff even though percentage still shows charge remaining. Complete one full discharge-to-zero followed by a standard charge to 100% without fast charging — this forces the coulomb counter to rebuild its curve against the new cell. After that cycle, check whether shutdown still occurs above 3.50V.

Fast charging stopped working after I put in the replacement cell — the phone only charges slowly now.

On the first cycle after a cell swap, the iPhone 11's charge IC can reject the USB-PD fast charge handshake while the BMS on the new cell is unverified. This is a one-cycle behaviour, not a fault. Run the phone through one complete standard 5W charge to 100% and let the BMS complete its initialisation. Fast charging should resume on the next plug-in; if it does not, check that the Lightning cable and adapter both support USB-PD at 9V/2A.

The iPhone 11 won't turn on at all after the replacement battery sat in the drawer for a few months before installation.

A Li-Polymer cell stored at partial charge self-discharges over time. If the cell dropped below approximately 2.5V per cell during storage, the BMS enters a lockout state and blocks normal charging to prevent damage. Connect the phone to a 5W charger and leave it for 30–60 minutes without attempting to power it on — the charge IC will trickle current into the cell at a safe rate until voltage recovers above the BMS re-enable threshold. Once the Apple logo appears, allow a full charge to 100% before use.

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Apple iPhone 11 Replacement Battery, 3.83V, 3100mAh, Li-Polymer 1

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