Apple iPad Air 3 A2134 Replacement Battery 3.8V 8100mAh

Apple iPad Air 3 2019 — 3.8V Li-Polymer Replacement Battery (A2134 / 616-00540)

This 3.8V, 8100mAh (30.78Wh) Li-Polymer battery replaces the original cell in the Apple iPad Air 3 (2019), covering the 10.5-inch models under device identifiers A2152 and related configurations. It fits the full iPad Air 3 lineup released in 2019. Use part numbers A2134 or 616-00540 to confirm this is the correct battery for your specific unit before ordering.

• iPad Air 3 2019 compatibility: All iPad Air 3 units share the same battery bay dimensions, connector pinout, and BMS handshake protocol regardless of storage tier or colour variant. The 180.80 × 161.70 × 2.90mm cell geometry seats correctly in every A2152 chassis without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on an iPad Air 3 unit and confirmed the BMS negotiated correctly with the charge IC — no protection-circuit trips, no thermal flags, and voltage held steady under combined display and Wi-Fi load.
• Post-swap fuel gauge reset: After installing this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100% without using the tablet. This single cycle recalibrates the fuel gauge IC against the new cell and corrects the inaccurate percentage readings that typically appear immediately after a swap.

iPad Air 3 shutting down at 15–25% remaining after battery replacement

The iPad Air 3 draws heaviest current when the display is at full brightness and Wi-Fi is active simultaneously. If the fuel gauge IC is still calibrated to the old, degraded cell, it maps voltage curves from that cell onto the new one — and the mismatch causes a premature low-voltage cutoff before the cell is actually empty. The fix is a single full recalibration cycle: drain to shutoff under normal use, then charge to 100% uninterrupted. After that cycle, the gauge IC resets its voltage-to-percentage mapping and the early shutoff stops.

iPad Air 3 not offering fast charge after a battery swap

USB-PD voltage negotiation on the iPad Air 3 requires the charge IC to complete at least one full accepted charge cycle before it unlocks higher-wattage charging tiers. A brand-new cell presents different internal resistance characteristics than the aged cell the IC was last calibrated against, so the controller defaults to conservative 5W input on the first charge. Plug into an 18W or 20W USB-C adapter and allow a full uninterrupted charge to 100% — the PD handshake will complete correctly on the next session and faster charging becomes available from that point forward.