System and methods for retaining a battery system included in a vehicle are presented. In certain embodiments, a system for enclosing a battery system may utilize a plurality of modular components. The modular components may include a plurality of first side components and a plurality of second side components coupled to the plurality of first side components. A first top component and a second top component may be coupled to the first side components. In certain embodiments, the second top component may be configured to prevent the first top component from being decoupled from the first side components.