How to Replace the Battery on the Sony ULT WEAR (WH-ULT900N) Wireless Bluetooth Headphones (DIY Repair Guide)
Does your Sony ULT WEAR (model number WH-ULT900N) refuse to power on, require frequent charging, shut down unexpectedly before the battery reaches 1%, experience reduced playback time, or appear as fully-charged when plugged into a power source? If your headphones experience any of these symptoms, it’s time to replace the battery.