To test all different kinds of batteries (18650 16340 14500 10440 Lithum Battery, AA, AAA, C, D, 9V, mini cell)
Check the power level of all 1.5V, 3.7V, 9V, and 1.5V miniature cells
Test multiple sizes of batteries in one unit. (1.5V: AAA, HP16, MN2400, R03, AA, HP7, MN1500, UM3, C, HP11, MN1400, SP11, LR14, UM2, D, HP2, MN1300, SP2, R20, UM1; 9V: PP3, MN1604, 6F22, 006P, 18650 16340 14500 10440 Lithum Battery)