Lenovo — Lenovo A6000 battery draining quickly

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Hyderabad, Andhra Pradesh

Dear, I have purchased Lenovo A6000 mobile phone on 11.03.2015 - since purchase there was no issue with the mobile for five months and suddenly there was a issue with battery draining - On 03.09.2015 I have consulted Lenovo service centre and expressed my concern regarding the same and they have advised to update the software - accordingly I have deposited my mobile with them on 09.09.2015 I got a call from service centre and they have updated software - after software updation also the battery was draining quickly - again I have visited service centre on 19.09.2015 and they have registered my compliant and kept my my mobile under observation for 5 days - on 24.09.2015 I got a call from service centre and mobile was ready - when I visited service centre they replaced with new battery. Even after new battery the problem was remain same - without using mobile instrument (no running apps) the battery was draining quickly as stated above. Request you to please help me in this regard and let me know the solution. Satya.