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I want to know if is there a way to prevent my iPhone battery from charging, when I connect it to my MacBook.

I want to try my applications when I'm working, but I'm afraid that I will damage the iPhone battery.

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This isn't a way to prevent charging, but the answers at apple.stackexchange.com/questions/893/… suggest that overcharging is unlikely to damage your iPhone. – Daniel Lawson♦ Sep 23 '11 at 15:04
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Damage the battery how? There is no such thing as "overcharging" and having your device connected to a computer or an AC adapter will not harm it in the least. – cksum Sep 23 '11 at 16:56

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Not sure what worries the OP, but for myself my issue is to prevent iPhone from charging off my macbook's battery while out and about, because sometimes the iPhone have 70% battery and MacBook 80% and while syncing I don't want my iPhone ending up with 80-90% battery and zapping away precious charge from my MacBook and left my laptop with 60% charge after a sync.

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This is not answer of the question. – user97693321 Oct 20 '12 at 16:28
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You won't damage the battery. Your phone will be fine.

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Perhaps try it plugged into a unpowered USB hub? I can't guarantee it will help, but it might work.

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