Best Way to charge gel 7a 12v on way to field?
I have a van and keep my planes and field equipment in it all the time. My flying time is not planned most of the time since I'm on the road as a salesman. If I decide to fly ,I want to use my rear lighter outlet to charge my 12v gel battery on way to the field ,about an hour. If I just put a cig lighter plug with alligator clips ,will my car charge the battery safely while I drive or would it be better to get an 110v inverter and plug in my wall wart charger for the 1 hour I drive. The car charge rate could be potentionally be 40 amps and I don't want to gas or overcharge my gel battery inside my field box.