Reach your Android’s maximum potential by increasing speed, saving battery power and monitoring data usage with NetQin’s Android optimization app. Android Booster FREE will improve your Androids performance in seconds with it’s easy to use interface by helping you reclaim memory, save battery power, kill tasks and give you an easy way to uninstall unwanted apps. Android Booster also contains a handy Widget which gives you the power of one-click optimization.

Very simple and small application:
Shows the amount of electrical current available to the phone via a USB connection.

Protect your battery from excessive heating and prolong capacity.

Most Lithium-Ion (Li-Ion) or Lithium polymer (Li-Po) cells must not be charged above 45°C or discharged above 60°C. These limits can be pushed a bit higher, but at the expense of cycle life.

Better alternative to other Task Killers/Task Managers. STK from NetQin is one of the fastest and smallest task killers.
Quickly kill running tasks, save the RAM for your mobile. Save battery power. This is a free application.
We will try our best to make it faster, smaller, add features needed and easier to use.

This app lets you know the status of your phone's battery. The battery remaining is expressed as a percentage of the total battery.

Lightest and most useful FREE Android optimizer App.

Take a journey through a spiral galaxy in 3D! You will travel through the endless star fields of a majestic spiral galaxy. 2 DIFFERENT FLIGHTS ARE INCLUDED, SO IT IS LIKE GETTING 2 LIVE WALLPAPERS IN 1! You can choose between "Warp drive journey" and "Merkaba generator journey". Some of the UFO's, which visit our planet are using Merkaba generators to power their space crafts.

Smart GPS Battery is a very cool application to know about your phone battery level, temperature, usage left, charging status and ac/usb/wireless power source plugging. It comes with very simple design, neat layout, less size and rich UI.

Its main feature is the GPS Location notification via SMS.

How to use:-
http://www.youtube.com/watch?v=cD0BPyj5Yes&feature=youtu.be

Advanced Details:-
https://www.spikesroidapps.com

Battery Saver , the professional power manager , is the best free battery saving app which is capable of extending your battery life. And package size is the smallest of all battery manager apps.

Multicopter 3D Flight Simulator. Get race, update new parts and save the city!

One Power Guard is an unique battery protection app - One is all cool(xuan).
One Power Guard is a unique battery enhancement tool designed to conserve your battery power an increase uptime on rooted Android smartphones/tablets. One Power Guard will decrease your charging time and increase your device performance while also increasing your uptime.

Location Event Reminder is an application that, thanks to a technology certificated and developed by Fax3D’s team, let you performs various action when you’re at specific location. In add, you could share your activities with your friends on Facebook!

TRIAL VERSION WITH LIMITED FUNCTIONALITY! GET FULL VERSION TO HAVE THE BEST.

The hand held, ad-hoc drive test app for the RF engineer on the go!

Battery charge in the status bar. Fast. Simple. Beautiful.

SMS Notifier is Android (1.6+) application that allows customization of notifications for incoming text messages (SMS / MMS).

The ONLY 1 real battery life extender that makes your battery last longer(FREE)

Mobile Security and Antivirus makes sure your phone is secure and your privacy protected. The application, which taps Bitdefender’s decade of award winning experience fighting electronic threats, offers a robust defense against invasion of privacy, viruses and theft while saving battery power for its core purpose – communication.

GreenPower battery saver brings many extra hours to your battery life!

"Charge less by extending your battery life with this amazing app""!! (Sprint newsletter)

Turn your gallery into a slideshow wallpaper with cool 3D transition effects!

For ppl who are still paranoid about over-charging their smart-phone battery (which is highly unlikely), this app allow you to trigger a ringtone alarm when say battery reach 50%-100%. This alert you when the charge is completed.