Oh you asf using htc one, in order to improve you android phone battery backup you need to follow tips given below.
First of all install a battery indicator which the battery capacity in its percentage which helps you to identify the current usage.
Always switch off the connectivity features like bluetooth, wifi, gps, auto rotate. Only switch on these things only when they are necessary.
Always maintain low brightness level in the phone.
Always make sure that there is no unwanted apps running in background.
During certain interval of time don't forget to clear your ram.