Bang & Olufsen BeoPlay H7 Replacement Battery 3.7V 650mAh

Bang & Olufsen BeoPlay H7 / H8 / H9 Series — 3.7V Li-ion Replacement Battery (56467 201 012)

This is a 3.7V Li-ion cell rated at 650mAh (2.41Wh), built to replace the original battery in the Bang & Olufsen BeoPlay H7, H8, H9, and H9i wireless headphones. It powers both the audio amplification and Bluetooth radio simultaneously. Fit is confirmed against OEM part numbers 56467 201 012, 1973822, and PLB-103.

• BeoPlay H7 / H8 / H9 / H9i platform compatibility: These models share the same physical cell format, connector pinout, and BMS communication protocol across the range. The 3.7V nominal rail and 39.80 × 35.50 × 6.00mm footprint are consistent across all listed variants, which is why one cell covers the full cluster.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles under combined Bluetooth and audio load. The BMS accepted charge handshake without error flags, and cell voltage held stable across the draw curve. No thermal events occurred during sustained playback testing.
• First-charge protocol for BeoPlay headsets: Place the headset in the charging cradle immediately after fitting the new cell and allow a complete charge cycle before use. The BeoPlay firmware recalibrates its fuel gauge on the first full cycle — skipping this step causes the charge indicator to read inaccurately for several sessions.

Why the BeoPlay H9i cuts out mid-track on a new battery

The H9i runs active noise cancellation, Bluetooth, and audio amplification simultaneously — three concurrent draws from a single 650mAh cell. If the replacement cell ships at storage voltage (around 3.6–3.7V), the BMS can interpret transient load spikes as an undervoltage event and cut output before the cell is truly depleted. This is not a fault with the battery or the headset. One full charge cycle from the cradle brings the cell to 4.2V and allows the BMS to map its actual capacity, eliminating false cutoffs.

Charging cradle shows full charge but headset dies after short use

This happens when the cell arrives at storage voltage and the cradle's charge controller reads the resting voltage as near-full rather than triggering a proper charge cycle. The headset then runs on a partially charged cell while the indicator shows 100%. Seat the headset in the cradle, wait for the charging LED to cycle through its sequence, then leave it undisturbed for a full charge pass. Once the cell reaches 4.2V and the BMS logs it, the fuel gauge will report accurately from the next use onward.