Technical knowledge is required to replace the built-in rechargeable battery, it is not recommended for customers to do replace the built-in rechargeable battery by themselves. The device needs to be disassembled to replace the built-in battery. Since the device functions exclusively on the built-in rechargeable lithium-ion battery, other commercial products cannot be used.
For the built-in battery to be changed, service is required.  Go to Product Repair.
- The performance of the built-in battery decreases depending on the electrical discharge times, usage duration, usage environment, which will shorten the battery life. Once the available battery time when the battery is fully charged decreases to half of what it was at the beginning, the battery should be replaced.
- The built-in battery of a Walkman player can be charged approximately 500 times. If the battery life is short, refer to this article when the battery life is short even when the Walkman is fully charged .