i see a bunch of these on walmart ranging from 10-15$, all looking the same https://www.walmart.com/ip/Mavic2BatteryAdapter and i see it can work to externally power things such as a light, but you can also hook up a battery to it for extra power. im wondering how safe this is to the DJI battery, what kind of battery id need since im not seeing the connector type, if i can use 2 batteries or where i can buy a light to go on the 2nd port.