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There are zillions of ways that you can improve the battery life on an Android Smartphone, so you'll have to make a tradeoff regarding how much effort you want to put in. That said, most typical users shouldn't have trouble with power within a given day.

Their are 3 categories of user of their Smartphone Battery Life..  The Normal people,  heavy power users, and extremely multi-tasking people.

For normal people:

1. Make sure your display timeout isn't set to something ridiculous by checking in Settings»Display»Sleep and setting it to 15 to 30 seconds.
2. Make sure your GPS isn't running constantly (or in battery saving mode) -- it should only be running intermittently unless you're actively using Maps' Navigation feature.
   
   
   
   This means the GPS is running. 
   
   If it is running constantly and you know the reason why, adjust the offending app's settings. If you don't know why, check out step 4 below.
3. Dont set your brightness to "auto."Just set it to lower that you can see. You can do this from Settings»Display»Brightness or from Android power-control widget (which is available on most Jellybean+ native Android phones by default).
   
   
   
   The Android Power Control widget. The right-most button is for brightness, and the "A" stands for "auto."
   
4. Learn how to find your power hogs. Go to Settings»Battery and look at the list that's displayed there. This shows app power usage since you last unplugged your power cable, so it's most informative to look here at the end of a typical day's usage.
   
   
   
   
    
   For me, the usual top offenders are voice calls (which I usually do over bluetooth) and the screen, and I think this is generally acceptable. If you see one of your apps taking a big chunk of your power, poke around in its settings to disable the offending behavior -- usually something pertaining to frequent use of the GPS or accelerometers. (Pedometers are notorious for this. Although some Android pedometers use power responsibly, it's easy to write pedometers that don't.)

For people with atypically heavy battery use or other special cases:

1. Tell your phone to stop looking for cell service when you're out of range. (Although I don't exactly understand the mechanism, looking for cell towers apparently takes a lot of power.) If you spend long periods of time in areas of no service or poor service, this might be worth looking into. You can limit where and when your phone seeks service with tools likeAutomateIt.
2. Make sure that apps that update in the background are set to reasonable update rates. Check your weather apps, news apps, pedometers, anything pertaining to location and GPS, pedometers, Google Now, apps that vibrate a lot, and anything that auto-uploads.
3. Turn off bluetooth when you're not using it. The power controls widget makes this easy, but you can also do it from the window-shade's settings shortcuts.
4. If you get lots of calls and notifications that make your phone vibrate, disabling vibration will give you back a lot of battery. You can access this from Settings»Sound.

For desperate people with extremely atypically poor battery life:

1. Install Greenify to kill application running in background.
2. Install 
   
   
   Carat: Collaborative Energy Diagnosis. It takes about a week to get sufficient data to make a recommendation, but the information is usually worth the wait. It will also evaluate the quality of your battery, which could be an explanation if you're seeing particularly poor battery life.  
3. Turn off background app updates from Google Play. You can access this setting from within Google Play by selecting Settings»Auto-update apps.
4. Disable background updates from apps like weather, news, RSS readers, etc. (Do this from within the individual apps' settings.)
5. Turn off Google Now. Instructions: Page on Google
6. Disable syncing from your Google account for services that you don't use. You can do this from Settings»Accounts:Google»[Your account] and then unchecking the services you don't want.