stusmith Posted January 29, 2020 Share Posted January 29, 2020 I've been reading several discussions on battery packs. Did a little bit of math, and I think I came up with a way to get a decent estimate on how long a particular battery pack should last running Tetra. Basic electrical theory: Watts = Volts x Amps. Tetra requires 24 watts "for normal stable operations" at 5vDC. So the math works out to be 4.8 amps (A), or 4,800 milliamps (mA) -- (5 x 4.8 = 24) Milliamp hours (mAh) is a measure of power over time. So a 10,000 mAh battery pack provides 10,000 milliamps for 1 hour (at it's given voltage). To figure out the runtime, you just divide the mAh rating by the milliamps the device is drawing: 10,000 mAh/ 4,800 mA = 2.1 hours. A 20,000 mAh pack would provide about 4.2 hours, and a 28,600 mAh pack should give you about 5.6 hours. Am I correct on this, or is my theory wrong? Quote Link to comment Share on other sites More sharing options...
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