Rechargeable battery system

A combination handheld mobile radio device and rechargeable battery system, comprising:

• the handheld mobile radio device having a body and being portable, the handheld mobile radio having a terminal at a lower surface and configured to removably engage with a charging port;
• and
• the rechargeable battery system operably associated with and configured to provide electrical operating energy to the handheld mobile radio device, which is the primary source of operating power for the handheld mobile radio device and configured to provide electrical energy to an external battery, the rechargeable battery system having:
• one or more electrochemical battery cell;
• a body with a partial hollow cavity;
• a power port conductively coupled to the battery and carried within the partial hollow cavity, the power port is configured to engage with an external cord conductively coupled to an external power source for recharging the battery, the power port is configured to engage with the external cord for charging the external battery, the power port extends outside the body of the battery so that the power port engages with the external cord for charging the external battery;
• and
• a transformer conductively coupled to the power port and to the battery, the transformer being carried within the partial hollow cavity of the body, the transformer comprises one of:
• a linear regulator;
• a switching regulator;
• and
• a power management integrated circuit device;
• wherein the terminal is conductively coupled to the battery and carried on an outside surface of the body;
• wherein the terminal is configured to engage with a docking station to recharge the battery;
• and
• wherein both the docking station and the external power source provide electrical power to the battery during charging.