Sony Xperia XA2 Ultra Replacement Battery LIP1653ERPC 3.85V

Sony Xperia XA2 Ultra — 3.85V Li-Polymer Replacement Battery (LIP1653ERPC)

This 3.85V, 3500mAh Li-Polymer cell replaces the original LIP1653ERPC battery in the Sony Xperia XA2 Ultra, XA2 Ultra Dual SIM, XA2 Ultra Dual SIM TD-LTE, and H4213 variants. It restores charging capacity lost through cycle degradation on the original cell. Capacity is rated at 13.48Wh and matches OEM dimensions at 86.00 × 62.65 × 4.05mm for a direct fit inside the factory battery bay.

• XA2 Ultra platform fitment: The XA2 Ultra, XA2 Ultra Dual SIM, and TD-LTE variants all run the same 3.85V battery rail with identical connector pinout and BMS handshake requirements. One cell covers the full model range because Sony used a shared power architecture across these SKUs.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the XA2 Ultra platform and confirmed the BMS accepted the cell without triggering a fault state. The charge IC maintained stable current delivery across the full charge curve with no thermal events recorded.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This allows the fuel gauge IC to recalibrate against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the XA2 Ultra after a cell swap

This happens because the fuel gauge IC is still referencing the discharge curve of the old, degraded cell. The new cell has a steeper voltage-to-capacity curve near the lower end, so the IC misreads available charge and allows the phone to draw current past the point the cell can sustain under modem and screen load. The voltage collapses, the BMS trips, and the phone shuts off even though the percentage display showed charge remaining. Run one full discharge to 0% followed by an uninterrupted charge to 100% to allow the coulomb counter to remap against the new cell.

USB-PD fast charge not accepted on first cycle after replacement

On the first charge cycle with a new cell, the charge IC on the XA2 Ultra may reject the fast charge handshake and fall back to standard 5V charging. This occurs because the BMS on the new cell has not yet established a charge history, and the phone's charge controller applies conservative current limits as a precaution. Complete one full standard charge cycle first. On the second cycle, fast charging typically resumes at the expected voltage and current levels.