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Originally Posted by JBotAlan
WHOAOAOA!!! The picture (discussed about 1 post below yours) has 3 9v batteries!!! Can the OI safely work on 3batt * 9v = 27volts? Just curious 
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Those batteries are running in parallel, not series. Therefore, the voltage is still 9v. This is done to increase capacity, or, run time of the OI while being run on batteries.