Battery pack for portable electronic devices

FIG. 1 is a front end elevational view of the design of our present invention as it appears when used with a portable electronic device, which is shown in phantom for illustrative purposes only;

FIG. 2 is a rear end elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front and upper right perspective view thereof; and,

FIG. 8 is a rear and lower left perspective view thereof.

The broken line showing of the portable electronic device is included for the purpose of illustrating environmental structure only and forms no part of the claimed design.