Thank you for viewing! I purchased the Sony WF-1000XM4 earphones on Mercari on June 25th. I liked them so much that I bought the WF-1000XM5. I am now listing this product. You can check the remaining battery life in the photos, which show the battery at full charge and after more than an hour of use. As you can see in the photos, the battery drains very little, so I think it will last for about 2-3 years. The original seller confirmed that the batteries in the earphones and the charging case were replaced with new ones. If you like them, please buy them soon. This is a used item, so please refrain from purchasing if you are sensitive to such things. Due to shipping and commission fees, I have set the price as low as possible, so please refrain from negotiating a discount. Thank you for your understanding. Returns, refunds, and claims are not accepted. I will include new memory foam ear tips. - Model Name: WF-1000XM4 - Size: Small, Standard - Features: Memory foam, Noise isolation - Battery Condition: 100% charged - Connection: Supports LDAC - Transaction Information: New sale, with case