About this replacement
Philips Xenium X216 — 3.7V Li-ion Replacement Battery (AB1050EWM)
This is a 3.7V, 950mAh Li-ion replacement battery for the Philips Xenium X216 mobile handset. It replaces part number AB1050EWM directly. Fits phones where the original cell has degraded, lost charge capacity, or failed outright.
- Xenium X216 fit: The X216 uses a removable battery bay with a single connector keyed to the AB1050EWM form factor. Voltage rail is 3.7V nominal, and the BMS on this phone expects that range for normal charge termination. No other Xenium variant shares this exact cell footprint.
- Bench tested on actual hardware: We ran charge and discharge cycles on the X216 platform. The BMS accepted charge without triggering overcurrent cutoff, and voltage held within the expected 3.0V–4.2V window across the full cycle.
- Fuel gauge recalibration on first use: After fitting a new cell, disable any fast-charge mode if available and run one complete discharge-charge cycle before normal use. This lets the fuel gauge IC build an accurate discharge curve against the new cell before logging state-of-charge data.
Why the Xenium X216 reports wrong battery percentage after a cell swap
The X216 fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts from the real state of charge. The IC needs at least one full discharge down to around 3.0V and a full charge back to 4.2V to reset its reference points. Until that cycle completes, percentage readouts can read high or low by 10–20%. Run one uninterrupted discharge-charge cycle immediately after installation to correct this.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve and misjudges remaining capacity. The new cell's voltage drops faster under load — GSM modem bursts and screen backlight together can pull the terminal voltage below the BMS cutoff threshold while the display still shows charge remaining. The phone cuts out to protect the cell, not because it is faulty. Force a full discharge to the automatic shutdown point, then charge to 100% without interruption — after one complete cycle the gauge recalibrates and shutdowns at 20–30% stop.