Advanced Battery Level Alarm

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Alarm goes off when battery reaches desired percent (default is 80%). This version is a little more advanced than the others I have seen. When the alarm goes off, instead of manually turning off the alarm, all you need to do is unplug the phone and it turns off automatically.

(A word of advice: when setting a percentage, I would use two values instead of one; this is to account for those times where your phone charges so fast that it skips a percent. So if you want the alarm to go off at 75%, it would be wise to set the block to go off between 75% and 76%.)

(Also, you may need to change the alarm sound to one that is on your device.)