The Sharp 831 manual says that you can't use the external battery pack without the internal battery in place. However, mine seems to work just fine without an internal battery. Will this do any damage to my unit? Cheers Robin. ---------------------------- Robin Landy Manchester University [EMAIL PROTECTED] Mobile: 07968 775304 --------------------------- ----------------------------------------------------------------- To stop getting this list send a message containing just the word "unsubscribe" to [EMAIL PROTECTED]