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how to make a portable speaker usinga 3 to 4 volt battery. ?


why using the battery?
you can just plug the speaker to the device using a jack.
But if you still want an amplifier here are some simple and small ones:
https://www.instructables.com/id/Portable-Guitar-or-iPod-Amplifier-Amp-9v-LM3/
https://www.instructables.com/id/Build-Your-Own-quotTinny-Ampquot-small-amplifi/
You need an AMPLIFIER. Take a look on the right of the page here for some related designs>>>>>>>>>>>>>>>>>