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What are the visual differences on a F-Series handreader main boards that have battery backup and main boards that do not have battery backup?

See  Board Differences Battery Backup Circuitry  for a picture of the visual differences between a F-Series biometric handreader with a main board that has the battery backup circuitry and a unit with a main board that does NOT have battery backup circuitry.  The F-Series handreaders with main boards that have battery backup circuitry were manufactured mid-2010 and beyond.

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