Abstract: Modular connectivity and power management systems and associated devices and methods are disclosed herein. A modular system configured in accordance with implementations of the present technology can include, for example, a housing, a display, and a single, active printed circuit board including a variety of connectivity and energy management devices electrically coupled thereto. In some implementations, the printed circuit board can include a microprocessor, a micro controller, a power management system, a plurality of communication devices, and a USB port. The modular system can include an internal battery, an external battery, and can be configured to directly connect to a solar panel and/or a DC power source. The modular system can be configured to charge the internal battery before charging the external battery and/or can be configured to use power stored on the external battery before using power stored on the internal battery.