AKG N60 NC Replacement Battery 3.7V 320mAh Li-Polymer

AKG N60 NC — 3.7V Li-Polymer Replacement Battery (AEC402933)

This is a 3.7V, 320mAh Li-Polymer cell for the AKG N60 NC wireless noise-cancelling headphones. It replaces the original AEC402933 pack when the headset no longer holds charge or cuts out during playback. Dimensions are 34.70 × 28.60 × 4.00mm — verify fit before ordering if your unit has been previously serviced.

• N60 NC compatibility: The N60 NC runs a single Li-Polymer cell at 3.7V nominal to power both the audio driver and the active noise cancellation circuit simultaneously. The AEC402933 part number is tied to this dual-draw architecture — the BMS on this headset expects that specific cell profile to manage both loads correctly.
• Bench tested on actual hardware: We ran this cell under combined ANC-plus-audio draw and confirmed the BMS completed its handshake, accepted a full charge cycle, and held voltage within spec across the load transition from idle to active noise cancellation.
• First charge on the N60 NC: Place the headset on its charging cable immediately after fitting this cell and let it complete one uninterrupted full charge before use. The N60 NC tracks cell state from the first cycle — starting from a partial charge causes the battery indicator to read inaccurately for the life of the pack.

Why the N60 NC cuts out mid-track when ANC is active

The N60 NC draws from one cell for two simultaneous loads — the audio output stage and the ANC microphone-and-processing circuit. When the cell ages, voltage sags under that combined draw faster than it would under audio alone. The BMS interprets the sag as a low-cell condition and shuts the headset down even when the indicator still shows charge remaining. A fresh cell at full 3.7V nominal resolves the sag because the internal resistance is low enough to sustain both loads without tripping the cutoff threshold.

Battery indicator frozen at full after replacement

This happens when the replacement cell is installed at storage voltage — typically around 3.6V — and the headset never completes a calibration cycle. The N60 NC reads state-of-charge relative to the first full-charge reference it logs after a new cell is fitted. If that reference was never set, the indicator stays locked. Fix it by charging to 4.2V in a single uninterrupted session before the first use. After one full charge-to-discharge cycle, the indicator will track correctly.