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For more help be sure to visit our website at thank you. BATTERY REPLACEMENT On all of our active circuits, 9 volt batteries are used to power-up. The systems feature the latest in 1C circuitry, with very low power requirement. The battery is switched on when a cord is inserted into the input jack, so be sure to unplug the guitar/bass when not in use to avoid unnecessary power drain. NOTE: Unless the instrument is equipped with a separate battery box, the battery is contained within the elect