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Help me with making a small portable self powered amplifier that can work with phones?

Hi people im trying to make a small amplifier that can work with cellphones and the output must be atleast 5watts,and it must use batteries,if the circuit need the lm386 tell me how to use it and how to make it more powerful.thanks in advance

Not sure if this will help, but it's a start:
www.runoffgroove.com/littlegem.html