AEG Voxtel M320 Replacement Battery 3.7V 800mAh Li-ion

AEG Voxtel M320 — 3.7V Li-ion Replacement Battery

This is a 3.7V Li-ion cell rated at 800mAh (2.96Wh), built to fit the AEG Voxtel M320 mobile phone. The Voxtel M320 is a compact early-2000s handset with a slim battery bay — dimensions are 50.00 × 38.00 × 4.80mm, matching the original cell footprint. When the original cell degrades and the phone starts shutting down unexpectedly or won't hold a charge, this replacement restores normal operation.

• Voxtel M320 fit: The M320 uses a slim single-cell Li-ion pack with a low-current charge circuit typical of early-2000s GSM handsets. The connector orientation and cell thickness are matched to the original battery tray — no case modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS holds cutoff correctly at the low-voltage threshold and that the charge IC accepts the cell without triggering a fault condition.
• Fuel gauge recalibration after swap: After fitting this replacement, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before normal use. The Voxtel M320's fuel gauge IC was calibrated to the original cell's discharge curve — skipping this step leaves the percentage readout inaccurate for the first several cycles.

Why the Voxtel M320 shuts down suddenly at 20–30% battery remaining

An aged Li-ion cell develops higher internal resistance. Under the load of a GSM transmit burst — even a brief call connection — terminal voltage drops sharply below what the phone's protection circuit considers safe. The phone reads this voltage dip as a near-empty cell and cuts power immediately, even though the fuel gauge shows 20–30% remaining. Replacing the cell eliminates the resistance problem, but the fuel gauge will still misread until it completes one full calibration cycle from 100% charge to shutdown.

Phone shows incorrect battery percentage after fitting the new cell

The Voxtel M320's fuel gauge IC stores a discharge model built on the old cell's behaviour — it has no automatic way to detect a new cell was installed. Until recalibrated, percentage readouts will jump or plateau at values that don't match actual capacity. Run one full discharge to auto-shutdown, then charge to 100% without interruption. After that cycle, the fuel gauge resets its internal reference points against the new cell's actual discharge curve and percentage accuracy stabilises.