I am looking to get a battery-powered amplifier to play outdoor "coffee shop" and "storefront" sessions. I currently have one of the Roland MicroCube Guitar amplifiers, and I really like how it performs outdoors with the Jazzmaster guitar. Anyone out there have experience with battery-powered bass amps? Should I look into Roland MicroCube (for bass) or something else??? The instruments I'd like to amplify would be a Fender 1951 RI Precision and an Ergo EUB. I'd be playing with a guitarist who would also have some sort of battery powered amp setup. thanks for any suggestions or advice you can offer!