There was some mention, that Google supports power saving mode, using not standardized XEP (which isn't even official yet): http://dave.cridland.net/xeps/google-queue.html While Facebook supports something else with similar intentions: https://bugs.freedesktop.org/show_bug.cgi?id=38943 So I wonder what other XMPP servers (ejabberd, openfire etc.) do for this matter and how it affects battery life.