The EMEI Barcode and battery barcode are probably not the same length. When the scanner is set for specific length, he will accept only some barcodes.
Please check the length of the barcode.
Set the scanner for two specific lengths or for any length of barcode.
Try to scan again.
To set the scanner you would need programming barcodes. Those are listed in the DS6707 Reference Guide, provided at
http://support.symbol.com/support/search.do?cmd=displayKC&docType=kc&externalId=8397807apdf
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