Multiple interfaces for a rechargeable battery pack

A method, comprising:

• providing a rechargeable battery pack including an engagement surface configured to temporarily connect said rechargeable battery pack to an electronic device;
• connecting said rechargeable battery pack to said electronic device such that a first power connection terminal of said rechargeable battery pack engages a main power input terminal of said electronic device;
• attempting to power up said electronic device and if said electronic device does not power up, said method further comprising the steps of:
• connecting a first end of a power cord to an external power plug located on an outer surface of said rechargeable battery pack;
• and
• connecting a second end of said power cord to an auxiliary power input of said electronic device.

A method, comprising:

• connecting a rechargeable battery pack to a portable electronic device such that a main power terminal of said rechargeable battery pack engages a power input port of said portable electronic device;
• powering up said portable electronic device if said rechargeable battery pack is compatible with said portable electronic device and if said portable electronic device is not compatible with said portable electronic device said method further comprising the steps of:
• connecting a first end of a power cable to an external power output terminal located on an outer surface of said rechargeable battery pack;
• and
• connecting a second end of said power cable to an auxiliary power input terminal of said portable electronic device.