Battery HD is very nice battery information android app which is easily available in google playstore free of cost. I am using it for the past 2 years and found it quite useful.
In this app you can see lots of information about your battery like how many hours it took to charge the battery and on what time or date you last charged your battery. You also get information about battery usage like how many hours it will last if you play android games or watch hd videos.
My favourite feature is charge level notifications. By using this feature I get a notification whenever my mobile battery is left with 10% of battery. I also get a notification after the battery is fully charged. You can set the notification by voice or sound. So I am happy with it till now.