Contrary to what many guitar players think, switching to bypass mode on the footswitch does NOT turn off the power to the effect circuit! The pedal will remain energized
as long as a power source is connected and there's a cable in the input jack to provide the needed ground path. The footswitch only serves to switch the effect circuit in (engaged) and out (bypassed) of your signal path, and to turn on the indicator LED when the pedal is engaged. So if you're going to power the pedal with a battery, pull the cable out of the input jack when you're done playing. This will preserve the battery, since it grounds through the sleeve of the input cable; no ground connection to complete the circuit = no drain on the battery.
That said, if you prefer to use an AC adapter to power the pedal, the Boss PSA-120S is a popular and reliable unit:
https://www.amazon.com/R-O-L-PSA-120S-A ... B0012BPMHW
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