The app is great, but it is wasting battery by checking it's things nearly every minute, even if the next lesson is on the next day, or you do not even have a widget on your home screen. i am a dev too, and this should be easy to fix. The log output may tell you what I am talking about:

11-19 19:25:39.683: D/MainReceiver(5786): starts execution
11-19 19:25:39.683: D/toString(5786): unknown
11-19 19:25:39.683: D/getName(5786): unknown
11-19 19:25:39.683: D/CONFIG:(5786): refreshtime: 10
11-19 19:25:39.683: D/Task Notificator(5786): Task notofications disabled.
11-19 19:25:39.683: D/toString(5786): unknown
11-19 19:25:39.683: D/getName(5786): unknown
11-19 19:25:39.683: D/toString(5786): unknown
11-19 19:25:39.683: D/getName(5786): unknown
11-19 19:25:39.683: I/AppwidgetRefreshReceiver(5786): refreshing widgets
11-19 19:25:39.688: D/AppwidgetRefreshReceiver(5786): there are 0 big widget ids.
11-19 19:25:39.688: D/AppwidgetRefreshReceiver(5786): there are 0 small widget ids.
11-19 19:25:39.693: D/toString(5786): unknown
11-19 19:25:39.693: D/getName(5786): unknown
11-19 19:25:39.708: D/query(5786): week 1 timetable 1 day 2 time 1165 limit 1
11-19 19:25:39.718: D/query(5786): week 1 timetable 1 day 3 time 0 limit 1
11-19 19:25:39.728: D/MainReceiver(5786): Lesson is coming
11-19 19:25:39.733: D/MainReceiver(5786): next alarm in 1 Minutes