Philips Xenium X116 Compatible Battery 3.7V 1100mAh

Philips Xenium X116 / X125 / X126 / 128 — 3.7V Li-ion Replacement Battery (AB1050CWMC)

This 3.7V, 1100mAh Li-ion cell replaces the original battery in the Philips Xenium X116, X125, X126, and Xenium 128 mobile phones. It matches OEM part numbers AB1050CWMC and AB1050FWMX. The cell fits the same 53.18 x 34.00 x 6.80mm cavity and uses the same connector orientation as the factory unit.

• Xenium X116, X125, X126, and 128 compatibility: These four models share the same battery bay dimensions, 3.7V single-cell architecture, and connector pinout — which is why one cell covers all four. The BMS handshake protocol is identical across the range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Xenium platform. The BMS accepted the cell without triggering a protection cutoff, and the charge IC reached termination voltage cleanly at 4.2V.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge to auto-off followed by a full uninterrupted charge before using the phone normally. The Xenium's fuel gauge IC was calibrated to the old cell's discharge curve — skipping this step causes the percentage readout to drift immediately after installation.

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

This happens because the fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell hits the voltage cliff under modem or screen load — typically around 3.6V — the phone cuts power before the reported percentage reaches zero. The gauge hasn't learned where the new cell's usable capacity actually ends. One full discharge-charge cycle forces the coulomb counter to reset its reference points against the new cell, and the premature shutdowns stop.

Phone won't power on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If this cell dropped below approximately 2.5V per cell, the BMS enters lockout mode and blocks current flow to protect against unsafe charging of a deeply discharged cell. Plug the phone into a charger and leave it connected for 15–20 minutes without attempting to power it on — the charge IC trickle-charges the cell back above the BMS re-enable threshold. Once voltage recovers above 3.0V, the BMS unlocks and the phone starts normally.