App: Yahoo! Mail for Android is a battery sucker

Yahoo! Mail for Android is an app developed by Yahoo! Inc. to access Yahoo! Mail accounts directly from the smart phone.

There are quite some feedbacks in Android Market complaining that this app is slow, but I didn't experience any obvious slowness in my HTC Incredible S.

Despite that, I've uninstalled Yahoo! Mail because it consumed too much battery, and I couldn't find any setting to fine tune its battery consumption, such as controlling its sync behaviour.

Before I installed Yahoo! Mail, my phone will consume about 7% of battery at night during my sleep. After installed Yahoo! Mail, I noticed the battery consumption had gone to 14%, doubling up the original, and after I uninstalled it, the battery consumption now gone back to 7% during sleep again.

Looks like Yahoo! need to pay more attention to their QA before releasing the app.

Solution for Samsung Galaxy Tab unable to turn on problem

If you own a Samsung Galaxy Tab, have you ever encountered the problem of unable to turn it on after you off or reboot it?

The symptom could be:

• You press the Power button. No matter how long you pressed and how many times you pressed it, nothing happen. Your Samsung Galaxy Tab remains dead with a black screen.
• You press the Power button. It vibrates. But then it is dead again.
• You press the Power button while charging. It shows the battery charging icon for a while, then it is dead again. 
• You press the Power button. It freezes during boot up.

If you encounter this kind of problem, don't give up yet! Try this:

Touch any part of the screen with one finger, at the same time press the Power button. Wait for a while (and pray - might take up to 2 minutes). Your Samsung Galaxy Tab might come back to life again.

HTC Android 2.3.3 (Gingerbread) built-in battery reading graph

There are several 3rd party battery metering apps which can draw graph based on battery reading, but if you have recently updated your HTC smartphone to Android 2.3.3 (Gingerbread), your phone actually has a pretty nice built-in battery reading graph within the system. This feature is found in Gingerbread version of HTC Incredible S, HTC Desire HD, etc.

Go to Settings > About phone >Battery > Battery use and you'll see the screen similar to as below.

Note that on top of the screen is a slanting slope with information telling you how much time your phone is on battery since last charged. In fact, that slanting slope is your phone's battery reading graph. Right below the graph you will be able to see some blue marks. Don't worry, they are not screen display problem, but are actually indicators when battery is used by phone activities. If you charged your phone, you will also see green bar plotting the battery charging period.

Tap on it and you will get a clearer graph. The blue battery usage marks are further break down to the respective activity.

If you turn your phone to landscape orientation, this screen will also adjust itself to landscape view.

I think, with this nice battery plotting feature, you don't need to use any 3rd party battery metering apps anymore.