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...instead of a separate battery, you MIGHT be able to get away with using one of the readily available "super capacitors" commonly used by the BOOMBOX boys/girls.
...with the proper "sizing" (in Farads) the voltage will come-ON and fade-OUT like the interior lights do on newer cars (assuming the radio isn't one of those that needs a "keep-alive" voltage so it can remember station settings, etc.).
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• 2011 Chevrolet Cruze LTZ 1.4LT 6A
• 2009 Pontiac Vibe 1.8L/SFI 4A
• 2004 Pontiac Vibe 1.8L/MFI 4A
• 2003 Ford Focus ZX5 2.0L/Zetec 4A
• 1971 Dodge Charger 318 3A
• 1970½ Plymouth AAR 'Cuda 340/6BBL 4M
• 1968 Dodge Charger 383 3A
• 1967 Plymouth Barracuda Formula S 383 4M
• 1965 Plymouth Barracuda Formula S 273 4M
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