Does having Push enabled for Contacts and Calendar on an Exchange ActiveSync account drain the battery much? I have it only enabled for one Exchange account. Furthermore, only the Contacts and Calendar is enabled for push, I have disabled Email. Will the Exchange ActiveSync only connect to the phone when an update has been made to either my Contacts or Calendar? Or, does ActiveSync periodically connect regardless of updates, and therefore drainging the battery more? There are only about 4 updates per day to my Contacts and Calendar and I'm just wondering is it really worth having Push on all the time?