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Although this compatibility list is for the "smaller" battery, I don't see any model named "3420" so I'm gonna say NO.
What does it read in BIOS?
If you have already managed to open it, maybe try checking and re-seating the connector.
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ejn63
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Posted April 16th, 2026 16:24
Since the Precision 3420 is a desktop, you must mean the battery from a Latitude 3420.
If so, the answer appears to be no - the batteries are not interchangeable.