Sony Xperia XZ2 Replacement Battery LIP1655ERPC 3.85V 2900mAh

Sony Xperia XZ2 — 3.85V Li-Polymer Replacement Battery (LIP1655ERPC)

This 3.85V, 2900mAh Li-Polymer cell replaces the original LIP1655ERPC battery in the Sony Xperia XZ2 and its regional variants — SOV37, SO-03K, and H8296. It matches the stock voltage rail and connector pinout so the phone's charge IC and fuel gauge IC can communicate normally with the new cell. Capacity is rated at 11.17Wh.

• XZ2 variant coverage: The XZ2 sold across AU, JP, and EU markets shares the same battery bay dimensions and BMS handshake protocol — 73.80 × 52.80 × 4.80mm, same four-pin flex connector, same charge-termination voltage at 4.35V. All listed variants pull from the same replacement cell.
• Bench tested on actual hardware: We cycled this cell through the XZ2's charge IC at both standard and Qnovo adaptive charging rates. The BMS accepted full charge-termination and discharge-cutoff signalling without tripping protective lockout. Fuel gauge IC logged recognised cell chemistry on first handshake.
• First cycle after installation: On first use, disable Qnovo adaptive charging under Battery Care settings and run one complete discharge-to-charge cycle at standard rate. This gives the fuel gauge IC a clean discharge curve from the new cell before fast charging pushes higher current into an uncalibrated state.

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

The XZ2's fuel gauge IC holds a learned discharge curve from the original cell. When a new cell goes in, that stored curve does not match the new cell's actual voltage-versus-capacity profile. The gauge reads 25% remaining, but the new cell hits its voltage floor under modem or display load before that figure reaches zero. The phone interprets this as a hard undervoltage event and shuts down. One full uninterrupted discharge-charge cycle at standard rate rewrites the coulomb counter reference and eliminates premature cutoff.

USB-PD fast charge not activating on the first charge after replacement

After a cell swap, the XZ2's charge IC runs an impedance check on the new cell before it steps up to fast-charge current. If the cell's internal impedance reads outside the expected window on the first cycle — common on a cold or fully discharged replacement — the IC defaults to standard 5V/1A charging as a precaution. This is not a fault. Disconnect, let the phone sit at room temperature for ten minutes, then reconnect. Fast charging typically activates from the second or third charge cycle once the IC has logged the new cell's impedance baseline.