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I used a battery charger to power up an old radio from a packard. A lantern battery likely won't last very long. A lead acid or gel battery will last a while longer. Some battery chargers can be switched between 6 and 12V. Don't put 12V on it.
To figure out what's wrong with it will require a bit more work. Make sure to rule out problems external to the radio, like his car's wiring or antenna connection, etc.
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