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DIY portable speaker help

NecroFlex
By NecroFlex
in Hobby Electronics
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I want to make a portable speaker, big one since i have a lot of leftover unused speakers where i can harvest "membranes" from (some are from old home theatres, some from unused car speaker upgrades etc.)

 

I saw i can get a nice BT amplifier with basically everything built in already for connecting the speakers to it and power.

The main thing is, most of these are between 9-24V, some more powerful go up to 36V.

I want to make a battery system for it from leftover e-scooter batteries, which are 36v (42v max charge), so i'd need a dc-dc step down that also has the option to connect and charge a battery, while being able to provide atleast 10A of power.

 

I can find normal step down converters, but none have a battery option...or could i just hook it up some other way? 

 

EDIT: if this pic makes sense of what i wanna do:
image.thumb.png.554c443e171fda613f82c232186f0a3c.png

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