Sony Xperia XZ2 Premium LIP1656ERPC Replacement Battery 3.85V 3400mAh

Sony Xperia XZ2 Premium — 3.85V Li-Polymer Replacement Battery (LIP1656ERPC)

This 3.85V, 3400mAh (13.09Wh) Li-Polymer cell is a direct replacement for the Sony Xperia XZ2 Premium, covering model numbers H8116, H8166, and SOV38. It matches the original LIP1656ERPC specification for voltage, capacity, and physical dimensions (68.00 × 62.06 × 5.10mm). If the existing battery swells, no longer holds charge, or causes unexpected shutdowns, this cell restores normal device function.

• H8116, H8166, SOV38 fit note: These three model numbers share the same battery bay geometry, flex connector pinout, and BMS communication protocol. Sony released them across different regional markets — JP, EU, and US — but the battery specification is identical across all three variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an H8116 unit. The BMS accepted the cell without error flags, USB-PD handshake resumed normally after one full cycle, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one clean cycle to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the Xperia XZ2 Premium after a cell swap

The XZ2 Premium's Snapdragon 845 and 4K HDR display create high instantaneous current draws that expose any mismatch between the fuel gauge IC's stored discharge curve and the new cell's actual voltage profile. The phone shuts down not because the cell is empty, but because voltage sags below the SoC threshold under load while the OS still reports 20–30% remaining. This is a calibration gap, not a defective cell. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and closes the gap.

USB-PD fast charging not activating on the first cycle after replacement

On the first charge cycle after installation, the XZ2 Premium's charge IC may fall back to standard 5V/0.9A input instead of negotiating the higher USB-PD voltage tier. This happens because the BMS on the new cell has not yet completed its initial handshake sequence with the phone's PMIC. Unplug the charger, wait 10 seconds, and reconnect — the PMIC reattempts the PD contract negotiation and typically locks onto the correct voltage tier (up to 9V) on the second attempt. If it does not, complete the first full discharge-charge cycle and fast charging will activate normally from the second cycle onward.