I can give you 2 suggestions for rechargable battery powered amps the first one is the lightest in weight the second one is the best sound period but its heavy and expensive. Check out a "Mipro ma101" or a "ma202" both of which are great little amps that sound good, the second is a "AER compact 60 mobile" and its made in germany (hint!).....
I prefer to use one of these. http://www.ecrater.com.au/p/12947220/behringer-eurolive-b208d-active-pa
I connect it to a 12V 380W pure sinewave converter and have a couple of sealed lead-acid batteries.
It all fits into a plastic tool box which I place on a fold-up trolley...with speaker sitting on top.
It's 200W and puts out a huge volume with heaps of bass.
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