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Its a 9V spliced in with the existing 4 AAA's. I would not recommend adding any more current than what is going through there with a 9V added. To think that adding an extra AAA is controversial, a 9V is much worse, and crazy enough people are speaking of adding two 9V! My single 9V and 4 AAA's are working well, but are somewhat unstable. Like I said I wouldn't add any more power than that.
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