REUSABLE MODULAR SYSTEM FOR MAKING BATTERY PACKS IN SERIES AND PARALLEL CONFIGURATIONS

A battery pack system convertible among a series configuration, a parallel configuration, or both. The battery pack system includes a base component case having a housing configured to receive therein multiple batteries, and an expansion component case or a cap secured to the base component by a twist-and-lock feature. The battery pack system includes a positive conductor and a negative conductor running along an elongated interior of the base component case, and an insert composed of a dielectric and having a positive terminal and a negative terminal. The insert is configured to be inserted between adjacent batteries such that the positive terminal electrically connects to the positive conductor and the negative terminal electrically connects to the negative conductor to form a parallel-electrical connection between an adjacent battery pair, and such that, without the insert, an adjacent battery pair forms a series-electrical connection therebetween.