Gil Hamilton wrote:The greek Antikythera Mechanism wasn't a result of particularly high technology, it was just a really clever use of gears and was by and large a clock. I suppose you could call it a computer....I could call my wristwatch an analog computer by the same logic.
I'd say it was pretty advanced for 65 BC

And although it would have more in common with a modern day analog watch than a Pentium, it is a computer in the strict sense of what a computer is: a device that makes (relatively) high-speed mathmatical calculations. (Think Babbage)
Gil Hamilton wrote:As for the Egyptian batteries...
I believe I was mistaken. Although I'd swear I've read about Egyptian batteries, I can't find anything online except the Bahgdad Battery.
Gil Hamilton wrote:...It would have been an oddity in the ancient world, not a power source.
Oh, I've never heard of them being used for power generation per se. As CC noted, and as I've read, they were used for electroplating ceremonial armour, jewelry, etc. And I'd guess that precious metal blacksmiths were somewhat of an oddity themselves in those days
Regarding the construction, and electricity available:
...The nondescript earthen jar is only 5½ inches high by 3 inches across. The opening was sealed with an asphalt plug, which held in place a copper sheet, rolled into a tube. This tube was capped at the bottom with a copper disc held in place by more asphalt. A narrow iron rod was stuck through the upper asphalt plug and hung down into the center of the copper tube — not touching any part of it. Fill the jar with an acidic liquid, such as vinegar or fermented grape juice, and you have yourself a battery capable of generating a small current. The acidic liquid permits a flow of electrons from the copper tube to the iron rod — an electric flow — when the two metal terminals are connected.
...Experiments with models of the Baghdad Battery have generated between 1.5 and 2 volts. Not a lot of power....Other theories hold that several batteries could have been linked together to generate a higher voltage for the use in electroplating gold to a silver surface. More experiments with several Baghdad-type batteries have shown this to be possible...
Interesting, yes? Regardless, I still think that many ancient civilizations were much more advanced than we give them credit for today.