Yes, take power on any battery in the battery pack, the average discharge voltage of a single battery is 12V, and it needs to be reduced to 5V, a simple circuit can use 7805 or 317, and then get a USB interface. It is better if there is a DC-DC relief plate (high efficiency. If the LZ is not very good at it, it is still recommended to buy a car charger, the input voltage of the car charger is 12-24V, directly connected to it, and the DIY USB interface is saved, as long as it is waterproof.
Yes, take power on any battery in the battery pack, the average discharge voltage of a single battery is 12V, and it needs to be reduced to 5V, a simple circuit can use 7805 or 317, and then get a USB interface. It is better if there is a DC-DC relief plate (high efficiency. If the LZ is not very good at it, it is still recommended to buy a car charger, the input voltage of the car charger is 12-24V, and it is OK to connect it directly, and the DIYUSB interface is saved, as long as it is waterproof.