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also i note much confusion here about regulated vs switched mode. There are two types of power supplies, Linear and SMPS (Switched Mode Power Supply). Linear encompasses both semiconductor voltage regulator type devices and transformer based AC/DC conversion via full wave rectification and a smoothing capacitor. SMPS use semiconductor switches switched at very high frequencies and capacitors and inductors for subsequent filtering.
SMPS are extremely efficient (if loaded correctly). They are much more complicated than a standard transformer rectifying power supply. If built well they outperform linear supplies in all areas (physical and electrical).
Battery chemistry is a whole different topic, i would be using some kind of voltage regulator with one, and personally ill be using 12V SLA just because it is simple and easy. Li Ion is also an option but the dangers increase dramatically with the nasty chinese stuff out there. That being said a quality and safe Li Ion setup can certainly be had, but at a much greater cost than the simple 12V car battery (SLA).
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