Can we use this plug to charge our battery box in car while caravan is not connected

Just wondering if I can use this anderson to charge off my crank battery which has a anderson plug in the tub of the ute instead of the cig socket that is supplied with the battery box

Hi,Is this a charging lead that could be used to charge the battery inside the smart box or is it for devices. What amp is the inline blade fuse. My original 12V charging lead has been damaged or is faulty and I need a replacement, wondering if this would work or can you source the correct lead