If a 9V battery can supply 150mAh. Does that mean that is can supply 300mA for half and hour?

Question

If a 9V battery can supply 150mAh. Does that mean that is can supply 300mA for half and hour?

Answer 1

As a rough approximation, yes.

For the typical alkaline battery about

400mAhr capacity @150mA ==> 2.667hr

350mAhr capacity @300mA ==> 1.17hr.

http://data.energizer.com/PDFs/EN22.pdf

Answer 2

Yes, in principle, but it depends mostly on the condition (age) of the battery and temperature. It is best to derate the amp-hour rating of the battery by about 5% to 10% if the application is critical.

Answer 3

In the ideal case, yea. A battery is a chemical storage device, however, and there is a peak rate at which it will discharge due to limitations of the reaction and internal resistances.