Check to see how many apps you have running as this can quickly drain your battery.
Go to SETTINGS > DEVICE > BATTERY for a list of which apps use how much battery. You may need to adjust app settings to compensate.
You can use the “Recent Apps” Menu to close your apps. Making this a common habit will greatly increase your battery usage.
You can expect your NUU Mobile Smartphone to get you through the work day with moderate to heavy usage. Below is the expected battery life for each phone: