Some quick questions about cells and batteries...

Just some quick questions to see if I've got the concepts correctly.
Any responses, flames or pointers welcome:

1) With similar types, you can generally expect comparative battery
life to be proportional to the physical volume of material- i.e. twelve
D-cells can continuously supply 18V into a load longer than two 9V
batteries could, right?

2) Charging a sealed lead-acid battery is about as complicated as
connecting it to another current source and slowly pulling electrons
through it? In other words, *could* you safely charge a 12V motorcycle
or car or similar battery with an AC-to-DC wall adaptor and a simple
voltage divider circuit?

3) The same can be said about NiMH or NiCd batteries.

4) Do connecting cells in series add voltages but keep current the
same, connecting cells in parallel add current but keep voltages the
same?

5) Putting cells in parallel also increases the overall physical volume
of material. Thus, if you connect 10 ordinary D-cells in parallel you
still get ~1.5v but it will last roughly 10 times longer than a single
ordinary D-cell driving the same load. True, False or Maybe?

Thanks for any and all!

.

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