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For example, so I can test different USB ports on my computer and powered hubs to see if one charges my iPhone faster than another.

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marked as duplicate by bmike May 9 '13 at 18:31

This question was marked as an exact duplicate of an existing question.

    
If you don't want this to be duplicate, feel free to edit in you want to get this data from the device itself or from a computer other than Mac. – bmike May 9 '13 at 18:31

Since iOS can indicate the charge in percentages, you could simply get a pencil and some graph paper and wake the screen periodically and record the displayed percentages to fit that data to a charging curve.

We have some questions about getting the charge rate programmatically in iTunes, and you could ask if there is an API (private or public) by opening a question on http://stackoverflow.com but for users (as opposed to developers), the answer is no. You can't get a log file of the charge status directly from a computer or the device itself.

Here are some related questions that may help:

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