Simple and easy-to-use product for Mavic Mini battery charger and controller. If you have the basic kit, the only way to charge the batteries is to put them in the drone. This allows you to charge up to three batteries with the controller. Remember that it does NOT include a charger. This requires a charger with an output power of at least 18W. A simple USB charger from your phone or computer may not work. I have a Zendure charging station. It has two outputs that can be used for 100W and 18W charging. It works great with this device. Thus, it is a simple and convenient battery charging device and mini drone controller. Make sure you have a good charger.