Abstract: Systems including a rechargeable battery pack for continuously providing power to a cellular load system not yet connected to the electrical grid are provided. The system includes a rechargeable battery pack for continuously providing a requisite power to a specified electrical load, associated with at least one cellular radio system, for a time period including at least a time period between a request to an electricity supplier for a connection to an electrical grid for providing the requisite power to the specified load and a fulfillment of the request. The system further includes a standby battery pack and a first power source configurable to charge the rechargeable battery pack. The system further includes a power management system configured to: automatically configure the rechargeable battery pack or the standby battery pack to provide the requisite power and automatically reconfigure the rechargeable battery pack to function as a backup power source.