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Est. battery life in a Bass BB Preamp?

Hi,

Until now I have been happily using a Turbo Tuner as my only pedal. Those things can work for years on a single 9V and they have a Low Battery indicator, so I don't use a power supply. I do own a Boss PSA-adapter, but I figured it takes up space in my gigbag and is less reliable than a battery (very weak cord, depends on available wall warts etc.).

However, I bought a Bass BB Preamp for some slight crunch in a couple of songs. That pedal doesn't have a lo-batt. indicator off course, but I guess I'll be fine without the adapter, because the pedal is true bypass and it's 'only' a distortion (not a delay pedal for example), right?

I know Murphy's Law so I'll permanently put a backup 9V battery and a screwdriver in my gigbag, but I guess using batteries will be the easiest thing to do. I'm a bit of an eco-freak, but I guess one battery each 2 years won't be too bad considering the extra hassle with an adaptor.


So is there anyone who can shine in on this? How long will a battery in a Bass BB Preamp approx. last?