About this replacement
Bang & Olufsen BeoSound Moment — 3.7V Li-Polymer Replacement Battery (8700112)
This 3.7V, 3100mAh lithium-polymer battery replaces part number 8700112 in the Bang & Olufsen BeoSound Moment wireless speaker. It restores audio playback and wireless connectivity when the original cell has degraded or failed. Dimensions are 91.60 × 69.26 × 4.40mm — verify these against your original before fitting.
- BeoSound Moment compatibility: The BeoSound Moment runs a single-cell Li-Polymer pack at 3.7V nominal. This cell matches that voltage rail and the physical footprint of the OEM unit. The BMS accepts the same charge profile, so the speaker's internal protection circuit handles cutoff and balancing without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, logging BMS response at both high-draw audio output and Bluetooth radio-active states. The protection circuit held cutoff within spec and showed no false low-voltage trips during combined amplifier and radio draw.
- Monthly discharge practice for the BeoSound Moment: The BeoSound Moment spends most of its life on a surface, topped off frequently. Let the battery discharge below 20% at least once a month before recharging — constant top-off charging without a full discharge cycle causes fuel gauge drift and accelerates capacity fade on the Li-Polymer cell.
Audio distorting before the battery indicator reaches empty
As a Li-Polymer cell ages, its internal resistance rises. Under the combined current draw of the amplifier and Bluetooth radio at moderate-to-high volume, voltage sags below what the amplifier needs to swing cleanly. The speaker clips the audio signal before the fuel gauge registers critical. A replacement cell with lower internal resistance eliminates the sag that causes clipping at that draw level.
Speaker shows full charge but audio cuts out after extended play
Fuel gauge drift builds up when a cell is repeatedly topped off without a full discharge cycle. The gauge chip calibrates against the cell's voltage curve, and shallow cycling shifts that reference over time. The speaker reports high state-of-charge while the actual usable capacity is significantly lower. Run the new cell down to below 3.0V at the cell terminals — around 10–15% on the indicator — before the first full recharge to allow the gauge to re-anchor its calibration.