Hi , I have one of these and they are pretty good, sound, effects etc. I bought it for the battery and portability, to play my guitar in the yard with no power. Unfortunately, which seems to be an issue with them, is that when I crank it up using the batteries-it shuts down-very annoying. I'm looking for an alternative amp, as now I'm keen to let it go -doesn't do what I originally wanted it for, which is a portable, low volume practice amp that doesn't need mains power (that sound good). Any suggestions dear esteemed members, that would be a good alternative? Cheers in advance.