I don't think you really understand push... Your device stays awake keeping a connection continually open to the server to watch for new mail. To make an analogy of it, it's like I forced you to stay up the whole day and night staring at my mailbox so you could tell me as soon as the mailman comes with a letter for me, instead of letting you sleep and then take a peek in my mailbox to see if anything new has come. Of course you're going to have your batteries drained, you'd be tired too if you never got any sleep