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Battery question

I just bought an EBS Multicomp and Korg tuner, both take batteries, and both run off of them. I was wondering, if the units aren't turned on, if the batteries were draining since a cable is plugged in. I have a Sansamp DI, and I know the battery will die if a cable is left plugged in when not in use. I was wondering if all battery powered units were the same as the Sansamp.