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I fully charged my iphone 5s to 100% last night at 8:15. When I woke up this morning it was at 97%. That is around what it usually uses.
 
My iPhone 6 loses about 4-5% overnight (after about 14 hours of standby). I don't know if it's too much for an iPhone, but my iPad doesn't lose anything after the same amount of time.
 
I loose none when I haven't received push notifications.
I loose about 1-2 percent if I did receive push notifications during my sleep.

My iPhone is a 6+ 128gb one.
 
Both my iPhone 5 and now my iPhone 6 lose about a percentage per hour overnight while my phone sits untouched and unplugged with Do Not Disturb enabled. That's 8% over an 8-hour night. This to me seems very excessive, considering it should be doing almost nothing beyond receiving a few push notifications.

I could almost get two days worth of battery if I go to bed with 50% remaining, but when I wake up and it's down to 42%, that's not going to cut it. What's everyone else's experience? Thanks!

Sounds like defitnetly something is wrong there. Do you sleep in a area where cell service is pretty weak? That can be reason shy your battery drains overnight more, i noticed that when i sleep in the basement in my house in the bedroom , my battery drains a little more since it is trying to get a cell service.

But my 6 Plus drains sometimes not even 1% in a 8 hours nights rest, itll drain 1-2% the very very most at night
 
I usually charge my phone overnight. In the few cases where I didn't charge my phone overnight, I have typically only lost about 2-3% of the battery overnight between my 5s and now my 6. There was one night where I lost 9% but that was because I had a lot of notifications pushed to my phone over night (even though it was in Do Not Disturb mode).
 
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