No battery drain I know of from my tablet either, it is life lasting and you can use the battery operation, but I only use it like to instangram long video feeds some up to about an hour, others up to like thirty minutes, also notes, with a few drawing apps, and Rusty lake sometimes of it, depending on the mind mostly, it can last up to a long time fully charge, mine always gets down to around 75% when it is shut off and having the apps running.

 

Mine is a 830, was saying in general of the Galaxy Tabs...