Esitmating the battery life of the components for the test flight

The current draw was measured from the baloon exploder microchip, the gps, and, the buffer op amp, and the data aquisition arduino. The baloon exploder microchip draws about 22 mA while counting, the buffer draws 36 mA (used an lf411 to estimate, but this is a +/- 15V op-amp which we will be replacing with a one sided 12V one that will draw less), the data aquisition microchip draws 25 mA, and the gps draws 45 mA. We are missing current draw from a few 12V regulators, but these aren't in yet, but the draw should be rather low. The current draw from the actual fuze itself is negligible because it will only draw current for less than a second. This gave us an estimated total of 128 mA draw from the entire circuit.

We are planning to use two 9V batteries in series to make 18V which we can regulate down. These batteries have a capacity of 500mAh, giving us an estimated 3.9 hours. These batteries have an operating range of -20°C to 54°C. This should be more than enough for the test flight.