Only the current version so far — new entries appear as the app ships updates.
バッテリー残量+日付ウィジェット is a tools app by MOONKEY with 5,000+ downloads (about 5.3K estimated). Released Feb 19, 2012. Install growth, rank history, SDKs and ad networks.
From the store listing: “Date of the remaining battery capacity and today I immediately apparent on the home screen”