I just recently completed my dinky project which is used to read rfid tags and than i would transmit it to my pc to keep track of things.
But my RFID reader became very static because of power supply which i give it through adapter, so now I'm planing to make it handheld, so my questions are:
1. How should I calculate how much time it will stay on, on a 9V battery?
2. And how should I calculate it, if I'm given Ampere Hours or just amperes current dissipation rating?