Asus India — Battery Issue

Sir,
I had bought an Asus Zenfone 5 mobile a year ago.From the beginning itself I was having issues with the battery life of my phone.I don't charge my phone all the time nor any serious damages has been done.The battery lasts for maximum a day with normal usage and only a few hours with more frequent usage.It is pretty much annoying to charge the phone in intervals of few hours.It also heats up pretty fast on continuous usage. The model number of my phone is:ASUS_T00J (A501CG).
It would be kind if an immediate solution to my problem is suggested.