The ornamental design for a batterytester, substantially as shown and described.
FIG. 1 is a perspective view of the battery tester of the new design, comprising a top electrode, a cylindrical body, a second electrode at the end of an extended arm, a base slightly larger in circumference than the body, and two light bulbs on the body that glow when a good battery completes the circuit between the two electrodes.
FIG. 2 is a top plan view of the battery tester shown in FIG. 1.
FIG. 3 is a right side plan view of the battery tester shown in FIG. 1.
FIG. 4 is a front plan view of the battery tester shown in FIG. 1.
FIG. 5 is a left side plan view of the battery tester shown in FIG. 1.
FIG. 6 is a plan view of the rear of the battery tester shown in FIG. 1; and,
FIG. 7 is a plan view of the bottom of the battery tester shown in FIG. 1.