While the shop could simply raise the labor rate to cover these costs, most shops are up front and charge a simple to-use percentage which corresponds to the relative number of consumable products used during the course of the repair.
Regarding the cost to recharge an electric car, it is usually a lot less expensive to charge an electric vehicle compared to paying for gasoline. If electricity costs $0.11 per kWh and the vehicle consumes 34 kWh to travel 100 miles, the cost is about 4 cents per mile. Therefore, charging an EV with 24 kWh will cost about $2.64 to reach a full charge. If the price of gasoline is $2.00 per gallon and the vehicles gets 20 miles per gallon, the cost per mile $0.10 or about double the cost of recharging an electric vehicle.