Hi, I am in the process of designing a battery to use with a pair of FPV goggles for drone racing, the goggles require a 2 cell battery, but I don't have a 2 cell battery charger. I do have a bunch of TP4056 charging boards, and I was looking to design an all in one unit that would hold 2 batteries, the two charging circuits, and some sort of switching device in order to safely charge the two batteries. My plan is to use something like the pic attached, where the circuit would automatically detect a USB input, and disconnect the batteries from each other and the output, and reconnect them with the appropriate charging circuits. I don't know what type of electronic switch to use, so I just labeled them as relays. If anyone has ideas on what type of switch to use, or just flaws in this circuit, please let me know! (also sorry for the sloppy diagram, it's my first time drawing a circuit.)