Weird voltages from digital pins

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i have been playing around running arduino off battery power.
when weird voltages off digital pins , off 5v pins.
the battery @ 8.2 volts. above 7.4 volts should cause drop off in voltage regulator.

any help?

more details, please:

what battery?
what arduino?
how did connect parts?
what did expect happen?
what did happen?


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