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Busking Battery-Powered Bass amp?

I have the Roland Bass Cube RX for Double Bass & Electric running off my anker astro3 9v/12v rechargeable battery. My buddy has the Roland street for guitar and runs that off a 5V mobile rechargeable battery.
If you want to run using a rechargeable battery, wire up a lead with neg center pin and use the DC input. Roland stuff is reverse polarity to other main stream devices, cameras etc.
The battery compartment only works with alkaline AA batts.
 
If you want great tone and have a few bucks to spare buy a Phil Jones Double Four and a Lenmar Battery Pack. I use it and it's great.
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Sampson Expedition line but buy one with the Lithium Ion battery.

Call or go into a store because with all gear you can usually get them for a lot less than advertised

As a Samson dealer I was impressed and purchased one for myself. It is absolutely fantastic as a battery powered vocal PA; in fact I have used it with a small gig as the only speaker. As a bass amp - let's just say that if it had a wooden cab with a bass driver it would be the cat's meow for bass, but as it stands it is OK at lower volume but not maxed out - due to the cab. Still, it does work OK at lower volumes - and these lower volumes are probably as loud or louder than many other solutions - I have used it in the capacity as a street-gig bass amp and it functioned quite well.
 
People looking for solutions today may want to look at a small class-d head and a power tool type battery inverter like a Ryobi RYi150BG and some batteries like the Ryobi P166

Cordless tool batteries are really good these days and ryobi's come with a 3 year warranty. Better than most heads do.

Buy a few batteries and just swap them with a simple click when one wears low. Built in meters let you know when they're low. Some up to 9.0 Ah. Useful for tools also.