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all digital radios have a constant power wire to keep the memory once the radio is switched off this should only draw a very small amount of current almost unreadable with an amp-meter well below one amp but anything over one amp or even close to it would be enough to drain your battery

you could have a faulty radio or else its a very bad make of radio

if you bought it new take it back and tell them your problem

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Q: New stereo is draining the battery?
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