Certified mechanic availability is a challenge, it is a fact. However, it is an excellent car. If you drive 2000km or more per month, then Prius can save you about Rs. 10,000 / month in fuel costs.
There are 2 batteries in Prius. First one is conventional 12V (low voltage just like any other car) and second battery is Hybrid pack, which powers the car. So far Toyota has sold more than 4 million (40lac) Prius cars worldwide. For a brand new car, Toyota offers 100,000mile (320,000km) or ten years warranty. Even though warranty is not offered in Pakistan. We can still assume that the hybrid battery will last atleast 10 years. You may visit www/hybridcars.com and read a research conducted with a Brand New Prius 2002 model and same tests with a Used Prius 2002 model driven for ten years with 100,000 miles on it. There wasn't any noticeable difference between the two cars. Used Prius was up to the same performance as the Brand New one. Hybrid Batteries were still good after ten years.