How to Replace a Dead or Failing Battery on the Sennheiser Momentum 4 Wireless Headphones (DIY Repair Guide)
Do your Sennheiser Momentum 4 headphones (model number: M4AEBT) refuse to power on, require frequent charging, or shut down before the battery reaches 1%? If playback time has decreased noticeably or the device shows a full charge but drains quickly, these are clear signs the battery may need replacement.