How do you read the recharge properly on a r134a refill for your cars ac?
Take it to an A/C shop.
It depends on the capacity of the battery pack the measurement is measured in kilowatts per hour just like how you would receive from the electric companies. Additional answer If you think about it, the question is much like one that said 'how many gallons would a petrol car need at a refill?' How big is the tank and how empty is it when the refill starts?
It depends on the year of the car. From 1994 on, R134a refrigerant is used. Prior to that, they used R12 refrigerant (Freon). R134a is technically not "Freon". Be alert, however, as many older cars (like my 1986 Camry) have been retro-fitted with R134a systems, and can no longer accept Freon, as the two refrigerants are not compatible.