iPhone battery apps?

There are battery apps that give you details such as how long you have to use different things i.e - 3g, 2g, wifi browsing, 2d games, 3d games etc.

These apps offer a $0.99 upgrade to their app for something called "full cycle charge". It is supposedly supposed to increase your battery life or something like that. These apps are mostly rated 4.5+/5. I am wondering if anyone has these apps and if they actually work?

Also what does it do and is it worth the $0.99?

Thanks

Scam. Fake reviews.

are you sure? like this: https://itunes.apple.com/en/app/battery-doctor-pro-max-your/id340171033?mt=8

macobsessed said:

are you sure? like this: https://itunes.apple.com/en/app/battery-doctor-pro-max-your/id340171033?mt=8

Click to expand...

Battery Doctor Pro doesn't work properly in my iPad.

aaaand I rest my case. If there was a battery app that actually made your battery better, Apple would buy it and make it standard. Conclusion: scams, fake reviews.