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For 5 hours read 9 hours.you can pull 450mA for one hour or 50mA for 5 hours, which is the same amount of energy.
Every 9volt battery I've seen has the voltage rating printed right on it, yet none seem to list the wattage, or even amperage rating  so what gives, here?
Thanks, Minder, for the link  I will definitely check it out! Duracells, in particular, are the most common batteries I use, so this info should be quite helpful!Generally batteries are rating Ah mAH etc.
The better known manufacturers usually show the specs.
http://ww2.duracell.com/media/enUS/pdf/gtcl/Product_Data_Sheet/NA_DATASHEETS/MN1604_6LR61_US_CT.pdf
M.
Hello again, BobK! Thanks for the helpful Info, although I guess what I should have asked is, supposing a device ( transistor, LED, motor, etc...) requires 1 watt; could a typical 9 volt battery power it, and if so, for how long? In the past, I have come across "30 watt" speakers, "5 watt" motors, "1/4 watt" resistors, and so forth  I guess I'm just wondering about the maximum wattage a battery can handle.The current that a battery can supply to a short circuit is not well controlled and drops rapidly with use. In other words, you might initially get 2 or 3 amps from a 9V battery, but only for a few minutes.
The capacity rating of a battery tells you how long you can pull a given current from the battery. A typical rating for a 9V is 450mAH. Which means you can pull 450mA for one hour or 50mA for 5 hours, which is the same amount of energy.
But even that is misleading. At higher current draws, a battery cannot supply the same amount of energy as it can at lower currents.
Typically, an ordinary battery should not be used at higher current than the capacity, but there are exceptions. The rating is usually given to a usage of much more than one hour, often 20 hours is used.
Bob
Thanks, Alec_t  good catch!For 5 hours read 9 hours.
Thank you, Ratch, for the info. I do understand the distinction, but I'm still unclear as to exactly how much "power" or energy a battery can provide. Typically, I work with standard, common 9 volt "transistor" style batteries, and I'm just wondering about the maximum power such a source can supply. For instance, I've no delusions that a 9 volt battery could power a jumbo jet, but what about a "10 watt" speaker, or a "5 watt" motor, etc....?Watts are not a quantity that you can put into a battery. Wattage is a rate of energy transference. If you want to know how much energy is in a battery, don't ask for its wattage.
Ratch
Thanks, davenn  this is exactly the type of info I'm looking for! Unfortunately, I have no idea what a PP3 battery is, or what type I'm working with  typically, I'll just grab a common alkaline 9 volt, such as a Duracell or Energizer....if its a PP3 type 9V battery, they are just a low current battery up to around 350mA continuous till voltage starts dropping
Thank you, Ratch, for the info. I do understand the distinction, but I'm still unclear as to exactly how much "power" or energy a battery can provide. Typically, I work with standard, common 9 volt "transistor" style batteries, and I'm just wondering about the maximum power such a source can supply. For instance, I've no delusions that a 9 volt battery could power a jumbo jet, but what about a "10 watt" speaker, or a "5 watt" motor, etc....?