Michael Cook wrote:

> 2. Why are most batteries 1.5 volts? Why not 1? Most chips I use need
> 5v, so why not 5? Or 2.5?
>

Different battery chemistries produce different voltages. Managnese dioxide
(alkaline) produces a nominal 1.5 V potential per cell, lead-acid likes 2.0
V, NiMH & NiCd puts out 1.2 V, Li-Ion is about 3.6 V. Makes life
interesting when trying to design a range of battery products for a group
of devices.

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