One of the things we take for granted in our high-tech world is batteries. As we become more and more “wireless,” our dependence upon batteries increases, because so much of our personal and office equipment runs on battery power: PDAs, cell phones, pagers, clocks, wireless microphones, etc. Batteries give us convenience in our jobs and lives, but batteries can be expensive, so it's important to understand a few basics. There are two major types of batteries: primary and secondary. Primary ...

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