AB1050GWMT Philips E103 Replacement Battery 3.7V 1000mAh

Philips Xenium E103 / E106 — 3.7V Li-ion Replacement Battery (AB1050GWMT)

This is a 3.7V, 1000mAh Li-ion replacement battery for the Philips E103, E106, Xenium E103, and Xenium E106 mobile phones. It uses OEM part number AB1050GWMT and slots into the same battery bay as the original cell. Dimensions are 53.20 × 34.00 × 5.70mm — measure your original before ordering if you are unsure.

• E103 and E106 platform fit: Both models share the same battery bay geometry, connector pinout, and charge IC interface. The AB1050GWMT BMS communicates with the phone's fuel gauge IC over the same line used by the factory cell, so the phone accepts it without flag or warning.
• Bench tested on actual hardware: We cycled this cell on the E103 platform and confirmed full charge acceptance, stable BMS handshake at both charge initiation and cutoff, and no thermal event across three consecutive charge cycles.
• Fuel gauge recalibration on first use: After fitting this battery, run one complete discharge down to auto-off, then charge uninterrupted to 100% before normal use. The phone's coulomb counter recalibrates to the new cell's discharge curve during that first full cycle — skipping it causes erratic percentage readings for days.

Why the Xenium E103 reports wrong battery percentage after a cell swap

The E103 uses a fuel gauge IC that builds its discharge model from repeated charge cycles against the installed cell. When you swap to a new cell, the IC is still referencing the old cell's internal resistance curve — which no longer matches. The result is percentage values that lag, jump, or read higher than actual state of charge. One full discharge-to-cutoff followed by an uninterrupted charge to 100% forces the IC to re-anchor its coulomb count against the new cell. After that cycle, percentage tracking tightens up considerably.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — typically during a call or screen-on burst — before the fuel gauge registers low battery. A fresh Li-ion cell at 3.7V nominal can still hit a voltage cliff if the phone draws current faster than the cell can sustain. On the E103, the modem and display together pull enough current to cause the cell voltage to sag below the BMS cutoff threshold — around 3.0V — while the gauge still shows 25%. The fix is that first full calibration cycle; once the fuel gauge has an accurate map of the cell's voltage-under-load curve, it triggers the low-battery warning earlier and the phone shuts down gracefully instead of cutting out mid-use.