Sam4s 5200m?

Yes. The battery cannot hold a charge for a year. It will have lost everything. Best to check the battery as well in case it has been ruined by being held flat.
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If anyone needs more information, C-tech collective have the Samsung/ Sam4s ER-5200 manuals here:

http://the-checkout-tech.com/manuals/cashregisters/Samsung2.php

Registerman
May 2011