Usage was changed in the version 2. 0. Please read this description again. This widget supports only japanese android devices and an android emulator. If it doesn't work on your android device, your device or home app implementation may be something wrong because it works fine on an android emulator with default home app. I can't support in case of that.
The security report reveals that this application is safe. みお is the developer of the app which can be found in the Tools category. Touhou Battery Widget was rated 4.4 on Google Play.
This application has been downloaded and installed by over 100K users and the most recent update is dated May 3, 2013. You are able to get the .apk installer of Touhou Battery Widget 2.7 free of charge and have a look at users' reviews on Droid Informer. The file size doesn't exceed 2 MB and the app runs flawlessly on Android 2.1 and above.