Running MP3 player and 100W speaker on two wheeler with Battery which is on two wheel

[casiodxb]

Firstly i would like to admit that i do not know any thing about the electronics. But i want to request you all to provide solution to my problem. I am from India and i want to run mp3 player and speaker of 100W on running two wheeler but mp3 and 100w speaker should run on the power provided by battery which is basically present in two wheeler. Is it possible what is the procedure for it.

 

[Audioguru]

A 100W speaker works perfectly at only 1W or 2W which is all you need on a bicycle.
Bicycles do not have a battery. Cars have a battery that is 12V. It can power a simple amplifier that produces only 2W into an 8 ohm speaker or 4W into a 4 ohm speaker. A complicated (bridged) car amplifier produces 14W into a 4 ohm speaker.

What is the voltage and what is the capacity of the battery on the bicycle?