![]() So if you use two relatively high efficiency switching voltage regulators (one to give 5 Volts to run your Arduino and one to give 3.3 Volts to run your XBee), in theory the XBee will take 165 milliwatt hours, the XBee Pro will take 990 milliwatt hours, and the Arduino will take 250 millwatt hours. Your battery will provide 84 Watt hours of power. The Arduino will take about 50 mA of 5 Volts. They take 50 mA and 300 mA (respectively) of 3.3 Volts. You should have plenty of power for what you want to do. Your battery is 7 Amp hours, which means that it can more or less deliver 7 Amps of 12 Volt power for one hour. The battery we have is a NP7-12, 12v, 7.0Ah : Sealed Rechargeable Lead-Acid Battery.
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