UltraCOM2 Wireless Headset Replacement Battery 3.7V 1000mAh

UltraCOM UltraCOM2 / UltraCOM3 / UltraCOM4 — 3.7V Li-Polymer Replacement Battery (006-1170)

This is a 3.7V, 1000mAh Li-Polymer replacement battery for the UltraCOM2, UltraCOM3, UltraCOM4, and Wireless Indoor Handset. It matches OEM part number 006-1170. The cell dimensions are 52.60 × 34.20 × 5.00mm — the flat pouch format that fits the slim headset housing.

• UltraCOM2 / UltraCOM3 / UltraCOM4 compatibility: All four models in this line share the same cell footprint, connector pinout, and BMS handshake protocol, which is why a single part number covers the range. Swapping between models requires no wiring changes.
• Bench tested on actual hardware: We cycled this cell through combined Bluetooth audio and radio draw on the UltraCOM platform. The BMS held voltage steady across the load profile and the protection circuit tripped correctly at the low-cell threshold — no mid-call drop.
• First charge in the base station: Place the headset in the base station and let it complete a full charge cycle before making a call. The base logs the new cell during this cycle. Until it does, the talk-time indicator will not read accurately.

Base station showing full charge but headset cuts off after short use

A replacement Li-Polymer cell ships at storage voltage — typically around 3.7V — not at full charge. The base station may read this as charged when it is not. The BMS on the UltraCOM headset uses a resting voltage check, not a full capacity measurement, to report charge state. Put the headset in the base for a complete uninterrupted charge cycle before use; the indicator will update to reflect actual cell capacity once that cycle finishes.

Headset cutting out mid-call after the new battery is fitted

The UltraCOM headset pulls current for both the DECT radio and audio processing simultaneously during a call. That combined draw can cause voltage sag on a partially conditioned cell, tripping the BMS undervoltage cutoff. The headset will go silent and may restart. Run three to five full charge-and-use cycles — cell internal resistance drops across those cycles, and the voltage sag under combined load stabilises above the BMS cutoff threshold.