Monitor battery usage when you're running low on power
Like with all phones, battery life on an Android handset can at times become a very important issue.
You might be caught away from home or from the office without a power cable and with just one or two bars on your battery indicator. That would be fine, if you were not expecting an important call that could last for some time.
JuiceDefender UItimate carries a high price for an application, but what price can you put on communications?
The app is a power manager that lets you see where power is being used on your handset and change things accordingly. It works well, is easy to use, and is a lot less hassle than finding a pay phone.