Coolpad D 530
Very poor battery life

I bought Cool pad D 530 phone 2 weeks before. When i asked the reliance store person he told me the battery talk time is 4.5 hrs.

I am facing problem of battery is getting descharge after 4-5 calls.

Second problem I am facing that this phone hang up 10 times in a day.

Now when i visited store again they are unable to solve this problem and also they are unable to reply properly.

I would like to know what i should do to solve this problem