About this replacement
Sony Ericsson Xperia M2 Series — 3.7V Li-Polymer Replacement Battery (LIS1551ERPC)
This is a 3.7V, 2300mAh Li-Polymer replacement battery for the Sony Ericsson Xperia M2, Xperia M2 Dual, Xperia M2 Aqua, and D2302, among other M2-series variants. It replaces OEM part number LIS1551ERPC. Capacity is 8.51Wh and dimensions are 69.25 × 62.28 × 4.35mm — measure your original before ordering if you are unsure of your variant.
- M2 series compatibility: The M2, M2 Dual, M2 Aqua, and D2302 all share the same connector pinout, physical envelope, and BMS handshake requirements — that is why one cell covers the full range. Swapping between variants does not require any firmware or hardware change.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on M2-series hardware. The BMS accepted the cell without fault flags, and the protection circuit responded correctly to both overvoltage and undervoltage cutoff thresholds.
- Fuel gauge recalibration on first use: After installation, disable any fast-charge adapter for your first full discharge-to-charge cycle. This lets the Xperia M2's fuel gauge IC map the new cell's discharge curve before high-current charging begins — skipping this step is the leading cause of erratic percentage readings in the first week.
Sudden shutdown at 20–30% on the Xperia M2 after a cell swap
The Xperia M2 uses a coulomb counter that was calibrated against the original cell's voltage-to-capacity curve. A new cell with a slightly different discharge curve hits its voltage floor at a point the system does not expect — usually around 3.5–3.6V under screen or modem load. The phone interprets this as a fault and cuts power before the displayed percentage reaches zero. One complete slow-charge cycle from flat resets the coulomb counter's reference points and typically resolves the early shutdown.
Phone warm near the battery compartment during the first few charges
A freshly installed Li-Polymer cell has higher internal impedance than a broken-in cell. The charge IC on the M2 pushes a fixed current regardless, so more energy is dissipated as heat across that impedance during the first few cycles. This is normal and decreases as the cell conditions. If the device feels hot — above uncomfortable to the touch — stop the charge and let it cool before resuming. Warmth that persists beyond three or four cycles points to a charger delivering above the rated 5V/1A input, which you should swap out.