TMK Battery Alarm is a rather different alarm for Android that, instead of going off at a certain time, beeps when the battery charge reaches a certain level.
The number of settings you can modify on TMK Battery Alarm is limited: you can only choose the percentage of battery charge that will trigger the alarm and the sound the device will play at that point (of the three available). Once you activate it, the alarm will go off when your battery charge dips to that level.
Another interesting feature in TMK Battery Alarm lets you avoid 'overcharging' your battery when the device is plugged in, since this could damage the battery over time and reduce its life.
TMK Battery Alarm is a simple and lightweight app that can save you more than a few headaches. Ideal if you want to avoid running out of battery without realizing it, or just want to take good care of your device.