My airdots charging case recently broke due to the battery swelling and motherboard breaking. I tried to repair it my self : r/airdots
300mAh Charging Case with USB Cable for Xiaomi Redmi AirDots TWS Earbuds - Walmart.com
Amazon.com: Xiaomi TWSEJ04LS Redmi Airdot Wireless Earphone Bluetooth 5.0 Stereo Earbuds Charging Case Mini Headphones Sweatproof Sport in-Ear Earphones Black, Small : Electronics