Well it wasn't anything I did on Giddyup, but for Fathers Day, I made myself a Makita 18v battery adapter for my HK Onyx 5 "jobsite" speaker.
Ive had the Onyx 5 for several years at least and while it always sounded pretty dam good for a portable speaker, at best it would only run for about 4 hours on its tiny, internal 3.7v rechargeable battery. Sadly, it would ALSO automatically reduce volume output by about half when not plugged into the wall … once again in order to save its tiny battery life.
So when I recently looked at the AC/DC adapter, and I saw that it outputted a steady 19 DVC when plugged in…well being a Makita fanboy, a :lightbulb: when off in my head.
I bought a $12 battery adapter from amazon that came prewired with12 awg copper pigtails, an on/off switch, as well as a 15a inline fuse. After checking the output polarity of the wall wart, I simply pushed and twisted the wires into and onto the end of the extra proper size plug that I had lying in the always useful "drawer o' defunct and outdated electrical parts, cords and devices."
Since there was no sense in trying to solder copper wires onto the chrome surfaces of the plug, after getting a tight physical connection and ensuring continuity, I simply added some quick dry epoxy and electrical tape, which fused EVERYTHING together to make the new plug "jobsite tough"
Literally 15 minutes later and I had this done … its been playing LOUD all day (it is Fathers Day after all

) and the Makita battery is STILL showing all 4 LED status lights.
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