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- Nov 12, 2015
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I put together the attached graphs and quick reference table to help everyone determine what a normal battery looks like over the course of a normal flight. The ambient air temperature was about 26.5 Celsius which is about 80 Fahrenheit. There are 4 flights shown in the graphs (2 different batteries with about 20 charges on each). The quick reference table could be printed and used as a way to check that the percentage lines up with the reported battery voltage. An important note is that the voltages are under flight. For example, if you power up and your battery is at 15.5 V before take off, you battery is likely much less than 80%. As soon as you liftoff you can expect a big voltage drop and then that is the voltage you would use in the table. So, if it was at 15.5 V before take off and then on takeoff it drops to 14.5 V you are likely at 30% or less and should land.
To summarize the guidelines: when you power-up your voltage should be over 17 V, after you lift off it should be over 16 V, and you should land at 14.4 V (3.6 V) per cell. The battery will shutoff at 12 V (3 V per cell). For most people you can probably check the 17 V before takeoff and the 16 V right after you are in the air and then trust the DJI GO app, this is what I do. In my memory most crashes occur when the battery is around 15.5 V before takeoff and then quickly drops to 14 V once in the air, despite the DJI GO app showing a higher percentage....
I do not recall multiple flights within a 6 hour window being an issue (I do not do this), but if it has been longer best to charge up!
Enjoy!
Thanks go to @BudWalker for his dat converter tool that made this possible...
To summarize the guidelines: when you power-up your voltage should be over 17 V, after you lift off it should be over 16 V, and you should land at 14.4 V (3.6 V) per cell. The battery will shutoff at 12 V (3 V per cell). For most people you can probably check the 17 V before takeoff and the 16 V right after you are in the air and then trust the DJI GO app, this is what I do. In my memory most crashes occur when the battery is around 15.5 V before takeoff and then quickly drops to 14 V once in the air, despite the DJI GO app showing a higher percentage....
I do not recall multiple flights within a 6 hour window being an issue (I do not do this), but if it has been longer best to charge up!
Enjoy!
Thanks go to @BudWalker for his dat converter tool that made this possible...