The Insta360 ONE R Battery Base is a central component of the modular ONE R action camera system. It holds the interchangeable modules together. The Core module and any other module of your choice mount side by side on this Battery Base, connecting into electronic contacts on it to work together with it as one unit. At the same time, it powers the modules via a built-in 1190 mAh battery that provides up to 65 to 70 minutes of runtime. It's rechargeable via a USB Type-C port when fully assembled with two modules. It cannot be charged by itself.