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Robot Building for Beginners, Third Edition by David Cook

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CHAPTER 7

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Nine-Volt Batteries

Sandwich, the line-following robot, uses a 9 V battery for power. In fact, most of my robots use 9 V batteries because the batteries are so small and lightweight. In this chapter, you’re going to learn how to test a 9 V battery (see Figure 7-1) and find out about the differences in battery brands and chemistries.

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Figure 7-1. Alkaline 9 V battery

How many volts in a nine-volt battery? Yes, it’s sort of a trick question. Although the answer is somewhere around nine volts, the actual voltage varies based on what the ...

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