Typically we would recommend following our Drive Diagnosis and Recovery article at http://www.symantec.com/docs/TECH149679
However, it sounds like you have already started the recovery process, and decryption is moving along... Unfortunately, that version of PGP Desktop is so old, it would be hard to find an answer. In any case, it is not recommended to unplug a laptop during decryption, but most newer versions of Symantec Encryption Desktop will pause the decryption process when a laptop enters battery power. I can't say what would happen in version 10.0.0 ...
I haven't found anything discussing PGP Desktop 10.0 laptop battery decrypt / encrypt operations. However, I did find an excerpt from PGP Desktop 9.6 which advises that unplugging from AC power may cause a loss in data, so I would NOT recommend simply unplugging the laptop to move it over.