An article is disclosed which provides for powering or charging the battery of a variety of different electronic devices, with the article being in two parts. The first part has components such that it is "universal" for use with all of the variety of different devices, and the second part has components which are specific to the operation of only a single model, type or brand of such device or of closely related devices which operate with the same voltage and plug-compatibility requirements of the specific device. In particular, the article with both parts (modules) present will operate a specific model, type or brand of device. However one can disconnect the two parts from each other and connect a different second part for a different device to the same first part, thereby being able to operate two different devices with substitution of only one part (the second) rather than requiring substitution of the entire article when a difference device must be powered or its battery charged. The article is particularly useful for powering or charging the batteries of devices such as cellular telephones, computers and the like from house, office or other building electrical systems or from vehicle electrical systems.