[Anton Mas81]

Hi, i just bought bmw i8 2017. i am not sure if something is wrong with my battery or the car is like this. i went on sport mode for 9 miles the battery charged from 3% to 68%. the battery showed 6 miles on the right of the battery in blue. i went on comfort mode for 4 miles mostly 30 miles per hour and the battery shows 2 miles left and 30% of battery so it used 4 miles. i thought it will use 4 miles on only e drive mode not comfort mode or i am wrong. also i charged the battery home for 3.5 hours and the battery was full showing only 10 miles on the right blue usage of battery. then i went on comfort mode for about 8 to 10 miles and the battery drained again to almost 0. i drove about 30 miles an hour. i ask bmw dealer and they could not say nothing only if i want to check the battery it will cost me 170 pounds. any recomendation if i need to do the battery check. thanks