Very confusing issue with casio keyboard.

Joined
Dec 8, 2016
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Basically, the thing is supposed to run at 9.5v DC, the old batteries (6 AAA) are only putting out about 3v in series, but the keyboard works fine as long as the volume isnt turned up. However, when I put in fresh batteries (which together are putting out about 9.7v) the thing doesnt turn on at all. Does anyone have an explanation for this?
 
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