How to make a portable speaker for iphone/table?

Basically, i found two small speakers which are very loud. However, when I connect them to the audiojack and then to my phone, the music is very low.

But when i connected them to a small radio with 4 AA batteries, they were very loud.

So I want to make a small mini speaker box (portable). How do I add the voltage to them? Or is there any way I can connect them to 9V battery and then to my phone? I'm not good in electronics, please help.

Without knowing exactly what the two small speakers are, there's very little way to help you. It is like asking how to cure a sick person without knowing what disease they suffer from.

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