Sigor Numotion Replacement Battery 3.7V 5200mAh

Sigor Numotion / Nuindie Series — 3.7V Li-ion Replacement Battery (851446832.00)

This is a 3.7V 5200mAh Li-ion battery for the Sigor Numotion, Nuindie, and Nuindie Mini portable LED desk lamps. It replaces OEM part number 851446832.00 when the original cell no longer holds a full charge. Swapping it restores the lamp's full brightness range and cordless operation.

• Numotion, Nuindie, and Nuindie Mini compatibility: All three lamp models share the same 3.7V single-cell architecture and battery form factor. The LED driver circuit and BMS handshake are identical across the range, so one cell replacement covers all three variants.
• Bench tested on actual hardware: We cycled this cell through the full brightness range — from warm dim to maximum output. The BMS held stable under the higher current draw at peak brightness, and the protection circuit responded correctly to low-voltage cutoff without locking out the charging circuit.
• UV and multi-mode charging behaviour: Charge the lamp fully before first use. If the lamp includes a UV or high-intensity mode, a cell sitting at storage voltage can trigger a premature low-battery warning the moment that mode activates — a full initial charge prevents this.

Lamp not reaching rated brightness after battery replacement

A freshly installed cell ships at storage voltage — typically 3.6V to 3.7V, not the full 4.2V charge ceiling. The LED driver in the Numotion series requires adequate cell voltage to sustain maximum current output. At storage voltage, the driver throttles brightness to protect the cell. A full charge cycle before first use brings the cell to 4.2V and unlocks the full brightness range.

Lamp flickering or cutting out before the battery indicator hits zero

This usually means the LED driver is dropping out below its minimum input voltage threshold — not that the cell is empty. On high brightness settings, current draw spikes and cell voltage sags temporarily below the driver's cutoff point even when average charge is still reasonable. If flickering happens consistently at the same brightness level, step down one notch and check whether it stabilises. If the issue persists on a new cell, verify the USB-C charge port is clean and delivering a full charge — a partially charged cell will sag harder under load.