the thing is this that usually the batteries in the hybrid cars last for some what around 100,000 kms. So the imported car is usually having a low mileage. Hybrids are very popular around the world! Secondly the batteries are available in the market and even if not a good dealer may import those for you.
the will cost much more if imported. but they last long period of time so it is a good investment as you will save in fuel expenses over the period. and hybrids are recommended if you wish to use the car for domestic use only i.e. not the highways
Civic reborn runs fine on CNG and there are no such issues if you get it installed by a proper technician.. A properly tuned Civic runs smoothly on petrol and CNG at the same time.
Hope it answers your query