Abstract: A compartment for threadably replacing a flashlight battery holding handle end cap of a flashlight. A housing holds tools and has a collar on a proximal end thereof that screws the housing into the flashlight where the flashlight battery holding handle end cap was removed from. A coil spring sits coaxially in the collar and provides a negative contact previously provided by the flashlight battery holding handle end cap. A distal end of the housing threadably receives the flashlight battery holding handle end cap. The housing has a plurality of through bores allowing viewing into the compartment. A transparent removable jar is snugly contained in the housing and closes off the plurality of through bores and thereby waterproofs the housing, while allowing viewing therethrough.