Time to save some battery!

Besides the wonderful features of android there is a big snag, the battery! In android, the battery barely lasts for few hours and is a big problem for businessmen and other people. So some developers came I up with ideas of developing apps that save battery. But all those apps doesnt seem to work on all phones.
I have tested many such apps and was satisfied with only 3 apps.
The first one is JUICEDEFENDER . It is a great app with many profiles for different situations. It also has a great ui. But the free version has only two profiles. The paid versions, jd plus and jd ultimate cost around 3£ and 7£. Buying it will help a lot.  .
Google play - link
Second one is 2X BATTERY SAVER . This app is also good but less options to customise and no preset profiles. Recent updates seems not to support battery saving in all phones. But all in all its a good app.
Google play- link
The last one is antutu's BATTERY SAVER . Needs root access!! Click here . This app saves battery in various ways like setting cpu frequency and many more. This app is a good addon like feature to juicedefender.
Google play- link
Apart from these another idea is that to buy an alternate battery to keep up with your work when you are travelling!
Any doubts?? Please comment!!
Tags-
battery saver,antutu battery saver,alternate battery solution android,battery saver for android,juicedefender,2x battery saver