Portable power supply

摘要

A portable power supply comprising:
a housing;
a current source disposed in the housing;
a first battery cell connected to the current source;
a first transistor connected in parallel to the first battery cell;
a second battery cell connected in series to the first battery cell;
a second transistor connected in parallel to the second battery cell;
a first local controller connected to the first and second transistors for controlling the first and second transistors; and
an inverter connected to the first and second battery cells.