yesterday i was stuck in the jam for quite long. i was on eco mode and of course will engage to autostop for each stop (my each stop really take quite a while, at least 1 minute), and to one point of time when in the middle of autostop, my car engine started fire up again, but the sound is different this time, the sound had more acceleration power on it, and what's more? the acceleration did not stop, the RPM maintain at more than 1000. i quickly scroll the panel and notice the batt has gone completely EMPTY. yeah so i immediately know that the acceleration was to charge the batt. but am wondering,  what has caused the batt to drain so much during autostop and jam?

another thing is, while my batt was empty, driving with it means the power is back to 1.3. seriously, the car really feels like cant move at all O_O, and i can tell u guys, driving the car without the batt aint fun