yo3diu I disassembled LiteVNA, removed the existing battery, disassembled the battery, and found the following. The battery is not well sealed by the module that manages the voltage input and output. I checked separately that the battery is charging. I checked the control module separately. We assembled them together and they work. It doesn\'t seem normal to me to do such a thing, the product had to work. But in my country everyone says, when you buy something from China you say goodbye to money, maybe you\'re lucky to go, maybe not. I will post what I did that can help others. We have lost confidence in your products, they remain the cheapest but also with the most problems. Have a nice day