About this replacement
Apple iPhone 11 Pro — 3.83V Li-Polymer Replacement Battery (616-00659)
This 3.83V, 3000mAh (11.49Wh) lithium-polymer cell replaces the internal battery in the Apple iPhone 11 Pro (A2215, A2160). It fits the models listed and matches the OEM voltage and connector spec. Install it when the original cell can no longer hold a charge through a normal day.
- iPhone 11 Pro fit (A2215, A2160): These model numbers share the same battery bay dimensions, flex connector pin-out, and BMS handshake protocol. A cell built to 3.83V nominal works with the charge IC on all three variants without triggering a mismatch flag.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an iPhone 11 Pro board, monitoring BMS communication, cutoff voltage at load, and fuel gauge IC response. The cell held rated capacity and cleared all hardware health checks in iOS.
- First-cycle fast charge protocol: 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 USB-PD pushes current into an uncalibrated cell.
Sudden shutdown at 20–30% after a cell swap
The iPhone 11 Pro's fuel gauge IC tracks a discharge curve learned from the previous cell. After a swap, that stored curve no longer matches the new cell's actual voltage-versus-capacity profile. Under high load — cellular modem, GPS, or screen at full brightness — the cell voltage drops faster than the gauge expects, and the BMS trips a low-voltage cutoff before the percentage reading catches up. Run two full discharge-to-charge cycles without fast charging to let the coulomb counter relearn the curve. After calibration, shutdowns at elevated percentage readings typically stop.
iOS reporting battery health below 100% immediately after installation
iOS calculates battery health by comparing the cell's current full-charge capacity against a baseline written to the fuel gauge IC during the original factory calibration. A new aftermarket cell starts with no matching baseline, so iOS reads a mismatch and displays a reduced health figure or the "Unable to verify battery" message. This is a gauge calibration state, not a cell defect. Complete one full charge to 100% followed by a full discharge to automatic shutoff, then charge back to 100% — the fuel gauge IC will write a new baseline and the health reading will update accordingly.