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The 29421 is a replacement lithium battery pack for the CRS451/V and CRS456/V. 

The 29421 contains a 3.6 V 2.25 AHr AA battery with special connections on it to work with the CRS451/V and CRS456/V.

Lithium metal battery rules and regulations change frequently. Campbell Scientific, Inc., must be compliant with IATA and FAA regulations. If you want to ship a lithium battery within the United States via air transportation or outside the United States using any mode of transportation, please consult with our logistics experts before ordering to ensure your destination and shipment method can be served. There may also be quantity limitations depending on lithium content per battery. 

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