I did a seach on ebay for SIRIUS BATTERY and there are battery packs for Sirius radios to make them portable. Has anyone tried that? Mines plenty loud with a pair of headphones and it would be cool to make it really portable.
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As far as the StarX products on eBay, no one that I know of has tried them. Having said that and reading the seller's reviews of his product, it should work just fine. I believe you will see a similar functioning product from Sirius sometime this year.