How to convert any speaker to wireless bluetooth speaker for free or for cheap as chips

Hello guys!
Here i am gonna show you how to convert any speaker to bluetooth speaker. In this case i use Sony SS-CT31A center speaker , converted to bluetooth speaker with cheapo (£6 pounds) 5W bathroom shower speaker electronics. Instead of the very weak 300ma 3.7v Li-Ion battery i replace it with powerful Li-ion element from Apple Pro laptop battery to power the speaker. IT is 16.07Wh, equivalent of 4+Amps which is 13x more powerful and will give more than 13x times more music time for the speaker. The original input push connectors of the speaker i am gonna connect directly with the 3.7V battery. The intention of that is i am not sure how good is the bathroom speaker charging IC, so i can use external charger as well in case. Also the power from the ex- audio input is with permanent 3.7V, so can be used with 3.7 to 5V USB converter as Power bank. How good is that?
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Thanks and hope to see you in the next video!