Some interesting insights from our industry friend and legal expert Richard Ryan at Blakiston’s.
I like there T&Cs page 3
You must not establish a link to our site in any website that is not owned by you.
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Google won’t like hearing that 
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The SWEETS model is a useful checklist - I haven’t seen that one before.
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Is this a specific feature of certain drones?Not been aware of this function before, where the drone RTh at 20% battery
I think it’s been a feature of all DJI drones since the Mavic Pro .. and perhaps even before.
What happens at critical battery can be set .. RTH / Hover / Land.
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As I understand it, when the battery gets to 20% it triggers an inbuilt default response, which starts a count down, which you can then cancel, if you want. That, I know. The wording in the
Blakiston report suggests there is a setting where you can pre determine the battery % to be triggered.
Yes - you can set both the critical % and the low battery warning %.
Can on my Phantom 2 .. just checked.
I can’t find anywhere in settings for the Mini 4 Pro, where I can change the battery %. Does your Phantom work from an RC 2?
12 years too late ;o)