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In article , (gregs) wrote:
In article m, geolemon
wrote:

There is also another interesting application of batteries. To keep the gap
between alternator voltage and battery more even, a battery with an extra cell
can be used. This can be used for an amplifier system, almost eliminating
the need for a capcitor. This would be mostly separate from the rest
of the electrical system. Of course the question on how to charge this battery
arrises. It will charge to a degree with a hot alternator voltage, above 14 volts,
but the differential is what is trying to be avoided. It could be used as a buffer
and charged at home. The extra cell technique has been used with radio gear
that works more optimally at 13.5 volts.

greg