These are a must for active electronics. I installed the 3576 on my Fender Jazz bass special for my 18 volt set up and the 3577 on my Gretch Jr. bass for my 9 volt set up. Now I have easy access to changing the batteries and they're out of the control cavities where they were causing shortages and knocking things loose from being jammed in such tight places.
These battery boxes are perfect. I have used the single many times, and the double when upgrading guitars with active pick-up's to 18v. Great quality, simple and fuss free.
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