As you charge the tablet more and more the battery will last longer. My tablet was only managing 3 hours at the start now depending on what i am doing or how long i am leaving the device in standby i can get anywhere from 5 hours (Normal usage on Balance with a few games) to a whole 1 day and 2 hours (very light usage and mainly in standby).
Also just like phones Bluetooth is a complete power whore so your best bet is to turn it off when its not in use.
Retired Mobiles: HTC Wildfire (S-Off'd) HTC Desire HD (x2) (S-Off'd)
Moto G 4G
Rom: Stock 4.4.4
Recovery: Stock for now
Bootloader: Locked (Really temped to unlock but i will wait for now!)
Advent Nvidia Note 7 Tegra 4
Recovery: CWM 188.8.131.52