Ok...looked it up,

Car runs on a dual motor system, both electric and petrol... seems the car can cruise for short distances on electric alone and at slow speeds. When acceleration is required.. petrol kicks in and at speed. The innovation in the charging of the battery is that it is still being charged when braking.

So both engines run concurrently and although there are no real figures of speeds achieved, its pretty safe to assume that the first say 20kmph would be electric and thereafter is petrol driven. Battery can only charge when its being petrol driven, so the movement of the car alone is not enough to sustain battery power..... battery requires more energy in than it can output
But an obvious saving on fuel here.
Battery is warranted for 160,000klm or 8 years.

Not the sort of car id want to have to take to the mechanics at my own cost though... bet that friggin hurts!