About this replacement
Sony Xperia XZ2 Compact — 3.8V Li-Polymer Replacement Battery (LIP1657ERPC)
This 3.8V, 2750mAh lithium-polymer battery replaces the OEM LIP1657ERPC cell in the Sony Xperia XZ2 Compact. It fits the H8314, H8324, and SO-05K variants of the same handset. Swap it when the original cell no longer holds a useful charge through a normal day of use.
- XZ2 Compact family fit: The H8314, H8324, and SO-05K share the same battery bay dimensions, connector, and BMS handshake protocol. One cell covers all three variants with no adapter or modification required.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an XZ2 Compact. The BMS accepted the cell without error flags, and the charge IC stepped through trickle, CC, and CV phases cleanly at both standard and fast-charge rates.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated coulomb counter.
Sudden shutdown at 20–30% on the XZ2 Compact after a cell swap
The XZ2 Compact's fuel gauge IC retains the discharge curve from the old cell in its non-volatile memory. When the replacement cell's actual voltage drops below roughly 3.65V under modem or display load, the phone hits a voltage cliff the old curve didn't anticipate and cuts power to protect the SoC. This happens even though the percentage shown on screen still reads 20–30%. One full slow discharge to automatic shutdown, followed by a full charge to 100%, forces the coulomb counter to relearn the new cell's curve. After that cycle, the reported percentage tracks actual cell voltage accurately.
USB-PD fast charge not activating on the first cycle after replacement
Sony's fast-charge protocol negotiates between the charge IC and the BMS before ramping current above the standard 5V/900mA baseline. On a freshly installed cell with an uncalibrated fuel gauge, the BMS may refuse the high-current handshake as a precaution. Plug into a charger that supports Sony's Xperia fast-charge spec and allow one complete standard-rate charge cycle first. After that initial cycle, the BMS handshake completes normally and fast charging activates at the correct voltage step.