NGM Wemove Legende Replacement Battery 3.7V 1100mAh Li-ion

NGM Wemove Legende — 3.7V Li-ion 1100mAh Replacement Battery

This is a 3.7V Li-ion cell rated at 1100mAh (4.07Wh) for the NGM Wemove Legende smartphone. It fits directly into the Wemove Legende handset and restores normal boot and charging behaviour after the original cell has degraded. No OEM part number exists for this cell, but fit and voltage match the Wemove Legende battery bay.

• Wemove Legende fit: The Legende uses a compact 58.93 × 46.05 × 5.23 mm cell footprint with a 3.7V nominal rail. This replacement matches those physical dimensions and the voltage level the phone's charge IC expects, so the BMS handshake completes at first boot.
• Bench tested on actual hardware: We cycled this cell through charge, idle draw, and modem-active discharge on a Wemove Legende unit. The BMS held the protection cutoff correctly at both the low-voltage floor and the 4.2V charge ceiling without thermal events.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging if your carrier app or phone settings allow it. Run one full discharge down to automatic shutdown, then charge to 100% uninterrupted. This lets the coulomb counter recalibrate its lookup table against the new cell's actual discharge curve.

Why the Wemove Legende reports wrong battery percentage after a cell swap

The Wemove Legende tracks charge state using a fuel gauge IC that builds a voltage-to-capacity map from the original cell's discharge curve. When a new cell goes in, that map no longer matches the actual cell behaviour, so the percentage readout drifts — sometimes jumping 10–15% in either direction. The IC needs at least one uninterrupted full cycle to rewrite its internal table. Until that cycle completes, low-battery warnings may fire early and the percentage display will stay unreliable. Run the phone from 100% down to auto-shutoff, then charge in one session to 100% without interruption.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem or screen's minimum sustain voltage under load, even though the fuel gauge still shows charge remaining. The original cell had sagged gradually and the phone's shutdown threshold had never been triggered cleanly — so the OS percentage never matched real voltage behaviour. A new cell with a steeper discharge curve at lower state-of-charge can hit the BMS low-voltage cutoff faster than the fuel gauge expects. After the first full recalibration cycle, the reported percentage and the actual cell voltage align and the early shutdowns stop. If they persist past two full cycles, check that the cell connector is fully seated — a high-contact-resistance joint causes voltage sag under load at the connector itself.