Honda recalled CIVIC hybrids because of a software error that caused the battery life to reduce. (2006 - 2008) . Most blogs in the internet mention that after honda fixed the problem, fuel efficiency reduced.
Hybrid cars need to be "climatized". People in other countries purchase hybrids because they get the warranty. Those cars are manufactured to suit the weather conditions in their respective countries. Unless you buy a hybrid from a local agent you will not get your warranty. You may need to throw your car away for scrapping.
As for the battery life, yes it depends on temperature, but if i am not mistaken, battery life reduces in warmer and humid weather conditions.
By the way, even before 2011 budget hybrid tax was very low. People didn't notice it.
I suggest any one planning to buy a hybrid to ask from local agents why they are not offering the hybrid in sri lanka, there should be a pretty good reason for it.