IPhone loses battery charge while connected to MacBook! Is this NORMAL?

Just as an example, I connected the iPhone to my MacBook this evening; it had about 60% charge, according to the green/black "thermometer." Then, I did some other stuff, and when I checked the thermometer again, it was down to about 20%! It seems like the phone is discharging into the USB power port? The only successful way I have of fully charging my iPhone is through the supplied charger. I can only connect to the MacBook for syncing, then better get off before I lose charge! Am I the only one who is seeing this?

Hmm. Let me ask this: when the iPhone is in the dock and the dock is connected to the (awake) MacBook, does iPhone think it's getting power? That is, does the tiny battery icon at the top right have either a lightning bolt or a plug symbol? If it doesn't, then remove the dock and plug the cable directly into the iPhone to see if that helps. It may be that your dock is passing data (which we know because you can sync), but not power.

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