About this replacement
Philips Xenium W8355 — 3.7V Li-ion Replacement Battery (AB3000AWMC)
This is a 3.7V, 2800mAh Li-ion replacement battery for the Philips Xenium W8355 smartphone. It matches the OEM part number AB3000AWMC and fits directly into the W8355 battery compartment. Capacity is 10.36Wh, identical to the original specification.
- Xenium W8355 fitment: The W8355 uses a removable single-cell Li-ion pack with a proprietary connector keyed to the AB3000AWMC footprint. The BMS on the phone side communicates with the cell through a third contact pin — this replacement carries the correct thermistor resistance profile to pass that handshake without triggering a "battery not recognised" error on boot.
- Bench tested on actual hardware: We cycled this cell through the W8355 charge IC and confirmed the BMS accepted the charging profile without fault flags. Charge termination occurred at 4.2V as expected, and the protection circuit tripped correctly at the low-voltage cutoff threshold during discharge testing.
- Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging for one complete discharge-charge cycle. The W8355 fuel gauge IC needs to map the new cell's discharge curve before it can report accurate percentages. Skipping this step leads to erratic percentage jumps or premature low-battery warnings.
Sudden shutdown at 20–30% on the Xenium W8355
This is a voltage cliff issue, not a capacity fault. When the modem transmits or the screen brightness spikes, current draw pulls the cell voltage below the BMS cutoff threshold — even if the fuel gauge still shows charge remaining. A degraded or uncalibrated cell has higher internal impedance, so its terminal voltage sags faster under load than the fuel gauge IC anticipates. Running one full discharge-to-cutoff cycle followed by a full charge lets the coulomb counter reset its model against the actual cell curve. After that cycle, the shutdown threshold and the reported percentage align correctly.
Phone shows wrong battery percentage after installing the AB3000AWMC
The W8355 fuel gauge IC retains the discharge curve learned from the old cell. When a new cell goes in, the coulomb counter starts from a stale reference, so displayed percentage drifts from actual charge state. The fix is one complete cycle: drain the phone until it powers off automatically, then charge uninterrupted to 100% without disconnecting. After that single cycle the IC recalibrates its model to the new cell, and percentage readout stabilises to within a few percent of true state-of-charge.