My wife drives a Captur 1.5 dci automatic, she drives a lot of short distance and the battery is relatively fast empty so that the car sometimes starts very difficult when you were on the road again for a long time. When the car starts the battery loads just with 11,9 V After about 10 minutes also times with 12,8 or 13 and sometimes this jumps between 12 and 13 V yesterday was for example that the battery was charged with partly 14,2 V and today again with 11,9 V. But when I pull off the battery sensor it charges constantly with 13,8 V. Can it possibly be due to a defective battery sensor?