Remember about charging. Its very simple with these "smart" batteries. They regulate the amount of "charge" going to the battery. So, the Mavic multicharger puts out a max power, just under what the Autel Pro chargers max is. Completely safe. The battery will regulate the charge going in, and because you are not using a more powerful charger than the specs of the original one, the battery circuit can handle this easily. The "smart" batteries are different than regular Lipos that don't have the smart charging capabilities. Those....with the wrong charge going in, can be very dangerous. Keep in mind I am not a battery expert, but know enough to be dangerous....So, Ender, I believe you would be completely safe using a Mavic car charger, and Flip, same to you. When the output of the charger is less than maximum, it will just take longer to fully charge a battery.