So i removed 3 or 4 or a dozen apps I don't really use. Downloaded a couple, three, six maybe new ones. Now my battery usage went from lasting mostly the day, to only lasting until dinner. So I lost about 4 hours. interesting that. I check battery usage and it usually was Display was the biggest drain, not it is cell standby and phone idle (idle, really?) So how can I tell what is actually using battery?