Yeah, mine drops at most 3% overnight (usually like 2% though).
What DotCom2 is describing is in fact a problem. It should NOT be dropping by 30% overnight. But instead of sitting and waiting for Apple to do something, start troubleshooting!
Step 1. Identify all variables. Literally list them out on a piece of paper if you must:
-- Location services (and all sub-categories)
-- Cell signal
-- Email accounts (and all attributes of each one)
Step 2. Once you have a list, start testing them individually. Meaning, only change ONE variable at a time and observe the impact. So maybe on one night, turn off ALL location services. MAKE NO OTHER CHANGE. Does it still drop by 30%? If so, TURN THEM BACK ON and move to the next variable. If it doesn't drop by 30% maybe you should test EACH location service individually to see which one is causing the problem.
Assuming turning off location services makes no impact, the next night, test Cell signal theory. MAKING NO OTHER CHANGE, put the phone in airplane mode. This will disable it from searching for a cell signal constantly. In the morning, check to see if it went down by 30% again.
Assuming it still did, take phone out of airplane mode. The next night, totally delete one of your email accounts (or all of them if you want to test them all at the same time).
You see what I'm getting at here... eventually you should be able to pinpoint EXACTLY what is causing the drain. "Oh it looks like when I disabled the account that is syncing my contacts, the excessive drain stopped." Now you can further drill down into what specifically may be the problem with contact sync.
I don't disagree -- Apple should figure out what is happening here BUT it's NOT happening to everyone.
