Battery power supply for an industrial truck used in a potentially explosive area

A battery power supply (1) for an industrial truck (8) used in a potentially explosive area, the power supply comprising:

• a housing (2) having a housing body (47) and a housing lid (4), wherein the housing body (47) has a receiving chamber (48) for receiving a battery tray (3), which battery tray has an inner chamber (20) having a traction battery (25) arranged therein, and the housing lid (4) is releasably fixable on the housing body (47) by securing means (53), and wherein the battery tray (3) has a battery tray lid (49) and a base (16) having transverse walls (17) and longitudinal walls (18) extending away from the base (16);
• and
• at least one of the walls (17, 18) has, in a region adjacent to the base (16), a recess (19) penetrating the at least one wall (17, 18) into the inner chamber (20).