AB2000KWMU Philips Xenium E266W Replacement Battery 3.7V 1900mAh

Philips Xenium E266W — 3.7V Li-ion Replacement Battery (AB2000KWMU)

This is a 3.7V, 1900mAh (7.03Wh) Li-ion cell replacing part number AB2000KWMU in the Philips Xenium E266W and CTE266W. It slots directly into either handset and restores full power to the phone. Capacity matches the original specification from Philips product data.

• E266W and CTE266W compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS handshake requirements — the AB2000KWMU cell works across the entire Xenium E266 variant line without modification.
• Bench tested on actual hardware: We cycled this cell through the E266W's charge IC and confirmed the BMS accepted the charge handshake without fault codes. Capacity held within spec across three full discharge cycles.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. 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 Xenium E266W

This is a voltage cliff issue, not a capacity problem. When the modem transmits or the screen peaks in brightness, current draw spikes sharply. An aged or freshly installed cell with an uncalibrated fuel gauge can't sustain voltage under that load, so the phone cuts out even though the percentage display still shows charge remaining. After one full discharge-charge cycle, the fuel gauge IC recalibrates its coulomb counter against the new cell's actual voltage curve. If shutdowns persist after two full cycles, confirm the battery contacts on the phone are clean and making firm contact.

Phone won't power on after the battery sat in storage

Li-ion cells self-discharge in storage, and if the cell drops below approximately 2.5V the BMS enters lockout to prevent damage — the phone will show no response at all, not even a charging indicator. Connect the phone to a wall charger and leave it untouched for 20–30 minutes before attempting to power on. The charge IC needs time to trickle current into the locked-out cell before the BMS re-initialises. Once the BMS resets, the charging screen should appear and the phone will boot normally.