How many mA in a 1.5 volt triple AAA battery?

Depends on load, battery type and quality, temperature, etc. Life at a specific current is the key thing.

Here's the datasheet for a particular grade of energizer alkaline:

http://data.energizer.com/PDFs/E92.pdf

At room temp (21°C), time@current = capacity is roughly::

10min @1000mA = 100mAhr

1 hr @ 400mA = 400mAhr

4 hr @ 200mA = 800mAhr

9 hr @ 100mA = 900mAhr

50 hr @ 25mA = 1250mAhr

Wiki has great links for more info. You can start here, look at other wiki articles and check the external links:

http://en.wikipedia.org/wiki/Alkaline_battery

Here's a site with lots of info:

http://data.energizer.com/PDFs/alkaline_appman.pdf

General info:

http://data.energizer.com/PDFs/alkaline_appman.pdf

Battery life is specified in Amp hours. That is battery specifications will tell you how many hours the battery can supply a given number of Amps (or mA) for.

The maximum short circuit current of any battery at any given time is determined by the internal resistance of the battery at that particular time. Maximum short circuit current = (EMF of battery) / (internal resistance of battery). The internal resistance of a battery varies with the remaining portion of full charge the battery contains.

You mean how many mA will it deliver on short circuit, I reckon only about 100 or so, how long will it do this for? around 2 or 3 minutes.

be specific, there are two types dry(use and throw) and rechargeable,

their capacity are in mah(-Milli-ampere-hour). they comes in 500 mah, 600mah etc.