About this replacement
Philips Xenium W3500 / W3509 — 3.7V Li-ion Replacement Battery (AB2200AWML)
This is a 3.7V, 2000mAh (7.4Wh) Li-ion cell matching OEM part number AB2200AWML. It fits the Philips Xenium W3500 and W3509 smartphones. Swap it in when the original cell no longer holds charge or shuts the phone down unexpectedly.
- W3500 and W3509 compatibility: Both models use the same battery bay dimensions, connector pinout, and BMS handshake protocol. This cell — 77.54 × 62.92 × 4.34mm — sits flush in both housings without modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the W3500 platform. The BMS accepted the cell without fault codes, and the charge IC ran a standard CC/CV profile with no interruption.
- First cycle calibration on the W3500: On first use after fitting, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.
Sudden shutdown at 20–30% on the replacement cell
The Xenium W3500 modem and display draw a combined load spike that a depleted or freshly installed cell can fail to sustain under voltage. When cell voltage dips below roughly 3.5V under that load, the BMS cuts output to protect the cell — even though the OS gauge still reads 20–30%. This is a fuel gauge mismatch, not a faulty cell. Run one full uninterrupted discharge to near-zero, then charge to 100% without interruption. After that cycle, the coulomb counter recalibrates and shutdowns at partial charge stop.
Phone shows wrong battery percentage after cell swap
The fuel gauge IC on the W3500 stores a discharge curve built from the old cell's impedance profile. A new cell has different internal resistance, so the IC maps voltage to percentage incorrectly — often reading 100% minutes after unboxing or dropping to 15% without warning. The fix is a single full calibration cycle: drain the phone until it powers off, then charge uninterrupted to 100% with the screen off. After that cycle, percentage readings stabilise against the new cell's actual curve.