About this replacement
Sony Ericsson Xperia Z / C6603 — 3.7V Li-Polymer Replacement Battery (LIS1502ERPC)
This is a 3.7V, 2300mAh Li-Polymer battery for the Sony Ericsson Xperia Z smartphone. It fits the Xperia Z, C6603, Yuga, and L36i, among other variants in the same family. Capacity matches the original LIS1502ERPC specification at 8.51Wh.
- Xperia Z family fit: The C6603, L36i, and Yuga all share the same battery bay geometry, connector pinout, and BMS handshake protocol as the standard Xperia Z. One cell covers the entire platform.
- Bench tested on actual hardware: We ran this battery through charge and discharge cycles on the Xperia Z. The BMS accepted the charge IC handshake without fault codes, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- Fuel gauge recalibration tip: After fitting this cell, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging is introduced.
Why the Xperia Z reports wrong battery percentage after a cell swap
The Xperia Z uses a fuel gauge IC that builds a discharge model from the previous cell's history. When you fit a new cell, the IC still references that old curve, so the percentage on screen drifts from actual charge state. This is not a fault with the replacement battery — it is a calibration lag in the fuel gauge. Run one full discharge to near 0% and a full charge to 100% without interruption. After that cycle, the IC recalculates its curve against the new cell and percentage reporting stabilises.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff symptom, not a capacity fault. Under heavy load — active LTE modem, bright screen, GPS — the new cell's internal resistance causes a brief voltage drop below the shutdown threshold before the fuel gauge catches it. The phone cuts power to protect the SoC even though the displayed percentage looks safe. Let the phone cool for two minutes, then power it back on. After one full recalibration cycle the fuel gauge learns the cell's sag profile and adjusts the low-voltage warning trigger to account for it — targeting a resting voltage of around 3.5V before shutdown.