About this replacement
Apple MacBook Air 11" A1370 — 7.3V Li-Polymer Replacement Battery (A1406)
This is a 7.3V, 4680mAh (34.16Wh) Li-Polymer battery for the Apple MacBook Air 11" A1370. It fits the A1370 chassis across 2010 and 2011 production runs, including MC965 and MC968 configurations. Use OEM part number A1406 to confirm fitment before ordering.
- A1370 platform coverage: The 2010 and 2011 MacBook Air 11" share the same battery bay geometry, connector pinout, and BMS handshake protocol. Both model years use the A1406 cell with identical voltage rails and a six-pin ZIF-style connector to the logic board.
- Bench tested on actual hardware: We ran this cell on an A1370 logic board and confirmed the BMS completed its initial handshake without faults. Charge acceptance was verified from depleted state through to full capacity at the standard 8.7V termination voltage.
- Post-install calibration on A1370: After fitting, discharge the machine fully until it hibernates on its own, then charge uninterrupted to 100% without waking it. This resets macOS's battery learn cycle and clears the inaccurate "Service Battery" warning that typically appears after any cell swap on this chassis.
Why the A1370 reports poor battery health immediately after a cell swap
The A1370 stores cycle count, full charge capacity, and health status in EEPROM on the battery's own BMS board. When macOS reads a new cell, that EEPROM data does not match historical discharge curves the OS has logged. The System Information panel then flags the battery as "Poor" or shows a reduced design capacity figure. Running one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% forces the SMC to rewrite its reference data against the new cell's actual characteristics. After one to three calibration cycles, the health reading normalises.
MacBook Air A1370 shutting down at 20–30% charge shown on the menu bar
This is a voltage cliff failure, not a capacity fault. Under combined CPU and display load, the cell voltage drops sharply before the fuel gauge reaches zero — the SMC detects sub-threshold voltage and forces an immediate shutdown to protect the logic board. The fuel gauge IC has not yet calibrated its discharge curve to the new cell's chemistry, so the percentage shown is inaccurate. Run two full discharge-to-hibernate cycles to allow the gauge IC to map the actual voltage curve. If shutdowns persist after calibration, check that resting voltage reads at least 7.0V on a multimeter before charging begins.