Review on DJI Mavic Charger Black CP PT 000562 by Mark Raj

I bought this hoping it would work to charge my batteries while we were out in our van. Our van has a second battery that charges while driving. I tried plugging the charger into cigarette lighter sockets powered by a second (household) battery and it didn't charge. I checked the battery voltage and found it to be 12.5V. I tried it on cigarette lighters coming from the main battery (starter) and it didn't charge. Rarely could I get it to work while driving, but many times it would stop charging for unknown reasons.