Teufel Real Blue NC Remote Replacement Battery 3.7V 500mAh

Teufel Real Blue NC — 3.7V Li-Polymer Replacement Battery

This is a 3.7V 500mAh Li-Polymer battery for the Teufel Real Blue NC wireless headphone remote control unit. The remote handles audio playback and noise cancellation adjustments — when this cell dies, those controls stop responding. Dimensions are 51.55 × 34.80 × 3.60mm, so physical fit is exact before installation.

• Real Blue NC remote compatibility: The Teufel Real Blue NC remote runs a single Li-Polymer cell at 3.7V nominal. The BMS in the remote unit expects this voltage rail to trigger IR LED output and register button presses consistently. A depleted original cell drops below that threshold before it fully exhausts.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a controlled bench rig. The BMS accepted the cell without error, IR output triggered normally at full charge, and voltage held stable across repeated button events with no false cutoffs.
• Polarity alignment on reinstall: The Real Blue NC remote PCB has no reverse-polarity protection. Confirm the positive terminal faces the marked orientation on the connector before seating the cell — a reversed install produces zero response with no damage indication.

Real Blue NC remote not responding after battery install

The most common cause is reversed polarity on the Li-Polymer cell. The remote's PCB draws no current and shows no LED feedback when the cell is installed backwards — it looks like a dead battery or a faulty unit. Remove the cell, rotate it 180°, and reseat firmly. If the remote still shows no response with correct polarity, check the connector pins for bent contacts before assuming the cell is faulty.

Remote only works within a few centimetres after battery replacement

Short effective range after a new install usually means the cell voltage is sitting below the IR LED drive threshold — often caused by a cell that shipped in a low state of charge. Connect the remote to charge via its normal port and bring the cell to full voltage before use. At 3.7V nominal and full charge, the IR output should reach normal operating distance. If range stays short after a full charge cycle, inspect the IR emitter window for debris or oxidation.