The present invention relates to a battery (1) that is configured to allow insertion of the battery into a battery holder (100, 200, 300) in two or more different directions. The battery has a housing (20); one or more battery cells (21) arranged within the housing; an electrical connector (30) comprising a plurality of contact elements (31), the electrical connector being arranged at an edge of the battery between a front surface (10) and a top surface (12) of the battery and being configured to allow electrical contact of counterpart contact elements of a counterpart connector (130 arranged within the battery holder with the contact elements from two different directions; and one or more bearing surface elements (40) arranged at the front surface (10) of the battery and configured to mate with one or more counterpart bearing surface elements (140) of the battery holder and to prevent substantial movement of the battery in a direction perpendicular to the top surface in mated condition.