Ion Block Rocker PA System:
It’s reasonably affordable, I’ve seen it sell for less than a hundred bucks new.
It has a rechargeable battery built in.
Medium weight & size, convenient handles & wheels, good sound.
http://www.ionaudio.com/blockrocker

SAMSON AirLine Micro - Wireless Earset System (mic)
This is meant for aerobics trainers!
It is a little expensive but worth every penny!
Light weight & small, everything included is small enough to fit into a deck of cards.
Rechargeable battery (mic)
Rechargeable battery (receiver)
Receiver is wireless & the mic is wireless, the mic has no body pack it’s just a small piece that fits behind your ear.
http://www.samsontech.com/products/produ......randID=1

Ion PA System plus the SAMSON mic together will give you an easy portable PA system with mic that is %100 battery operated!

We have 2 of the Fender Passport systems which work really well in most cases for our smaller shows and then we have the big EV's for our outdoor and auditorium or gymnasium shows.