How much power from various batteries?

How much power measured in VOLTS comes from the following batteries?
AAA
AA
Watch batteries (all, whats the smallest one?)
C
D

You don’t measure power in volts. Technically, volts is a measure of electromotive force (EMF), but everyone just calls it “volts” or “voltage”.

Power is measured in watts.

This is not just nitpicking. If you don’t get the terms right you will never understand this stuff.

Anyway, as the other posters said, all the “letter” batteries, in nonrechargeable types, are 1.5 volts terminal voltage under no load. Their voltage drops a bit under load, more under heavy load, and even more as the battery is used.

Common rechargeable types (NiCd, NiMH) are closer to 1.2 volts. Given the same load, their voltage does not drop as much as the non-rechargeables do.

Almost all watch batteries are 1.4 or 1.5 volts, but they can deliver far less current than the larger batteries. Not all watch batteries are Alkaline Batteries either – many are silver-oxide types.

(Dusty: “current per amp hour” is not a valid term either for anything being discussed here. There is current, and there is current over time, expressed in amps and amp-hours respectively… milliamps and milliamp-hours for smaller units. It is a bit confusing because “Amperes” already has a “per time” buried inside it – 1 Ampere is a rate of electron flow equal to 1 Coulomb of charge per second. So an “amp-second” would be the same as 1 Coulomb, and an amp-hour would be 3600 Coulombs – one C per second, flowing for 3600 seconds. )

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