Portable battery powered electrical apparatus with improved battery pack protected against inadvertent short circuit of the battery terminals

摘要

An improved portable battery powered electrical device is disclosed which includes a battery pack having normally inactivated battery terminals so that inadvertent short circuiting thereof will not produce an undesirable high amplitude short current thereacross. A normally open switch interrupts the current path in the battery pack which is actuated to energize such battery terminals only when the battery pack is fully interconnected and mated to the associated portable housing. Fuse means are included to prevent the use of unauthorized battery packs without the foregoing safeguard provisions.