On Jan 15, 2006, at 8:23 AM, Shay wrote:

> LED's shouldn't drain a 9 volt battery that quickly and the
> buzzer is almost never on.  Really, only 1 or 2 led's are lit at any
> given time and they're really low volt led's.

A typical 9V battery has about 500mAH of energy, so if you're
driving 20mA into LEDs, you can only expect a life of about 25 hours.
LEDs are low current compared to incandescents, but they're not all
that low power on an absolute scale...

BillW

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