Battery Boost?Drain? I recently updated my Note 2 to 4.3 and it has been working quite well. But today in the train I was using it and the battery level drained to 20%, Since the battery was low, I switched it off and came home. When I put it on charge and turned it on- the battery level said 67%. How come it got such a boost? When I took it to work today, it had only about 56% 
and I come home with 20 and all of a sudden its 67%
How?
This is  a sign that you overuse your battery,frequently leaving your apps on....your battery is damaged and might need to be replaced...but till you can do that...you can always:
1.avoid charging overnight 
2.use the correct charger
3.if you aren't using your data or wifi turn it off,to preserve battery life