IPhone Drains battery when mac sleeps

Couldn't find any other topics about this, just wondering if anybody else sees this or knows why this happens.
My iphone (1st gen 2G) charges fine, can charge with wall adapter or adapter plugged into usb on mac.
I prefer to just plug it into the mac, let it sync then leave it. What I have noticed though is if the mac goes to sleep - say I leave the phone overnight and the mac sleeps, when I look the following morning the battery gets drained. If I set the mac not to sleep this doesnt happen, if the phone is charged and left over noght not plugged in, it is fine, plugged into a wall charger no problem. It only happens if the mac is set to sleep.
I dont understand why the battery is drained by having it plugged into a mac that enters sleep mode? anybody got any clue why this happens?

I think that depends on the Mac and version of OS X you're using. On newer Macs the USB ports are left on so that you can use a USB keyboard or mouse to wake it up.
On my 24" Intel iMac I leave my iPhone charging via USB overnight while the computer is sleeping, but as the OP didn't mention exactly which iMac and which OS, I can't say what the issue might be.

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cbs20 wrote:
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Best from Austria

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IPhone Drains battery when mac sleeps

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