Adding bluetooth to an old Makita DAB Radio and powering it with Erbauer EXT batteries

Pulled my old Makita radio out from its grave and gave it a little update.
I added a bluetooth receiver and adapted the battery carrier to suit my Erbauer EXT battery range.
All done for under £20
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Links (affiliate) to what I used -
Disclosure: Some links in this post are affiliate links. I may earn a small commission at no extra cost to you.
Bluetooth Receiver - amzn.to/40nkLto | ebay.us/T5qTVW
DC-DC Stepdown Buck Converter - amzn.to/3sjhxdI | ebay.us/96RqjQ
Erbauer EXT Battery adapter - ebay.us/M6IUT4

[@sNEAKYnIGHTmUPPET]

why is there no audio?

[@Funeve]

Not sure, i can hear myself (cringe)