Why does Android system drain so much battery in Lenovo A6000?

My phone lost 50% battery in 4 hrs... Used 2G data and little bit gaming...android system & OS has consumed more than 30% Battery
You know its hard to withstand battery drain when a phone needs 3.5 hrs to charge
Plz help




Well, you are connected to data and gaming. Those really eat your battery fast.



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