Dji Community
Captain
Flight distance : 5381368 ft
United States
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Jyunte Posted at 2017-9-16 16:42
Ok, thanks everyone for your input. I've kept my Low Battery Level at 40%, but lowered my Critical Battery Level to 12% to prevent PLS (premature landing syndrome)!
Many Mavic pilots have no experience flying electric R/C planes and probably do not understand LiPo battery safety or care. Someone mentioned that it's good to run the Mavic battery down completely every once in a while. You should absolutely NOT do this! LiPo batteries can spontaneously catch fire when over-charged or when over *discharged*. When LiPo batteries burn, water will not put out the fire, neither will your fire extinguisher. They will continue to burn until the lithium is consumed and will likely set fire to whatever is close by (that's what your fire extinguisher is for)!
ignore my name of a moment, i was messing with someone that said i'm an example of the community and giving me crap.
you cannot run them down entirely, built in protection completely disables the battery if it drops below a certain voltage which is still above the min safe voltage. the Dji packs have multiple stages of protection built right in.. these are not dumb turnigy li-po packs that you have to externally maintain. these are smart batteries.. they dont let you have the opportunity to damage them is the big difference.
0% is not actually 0% remaining... when it indicates 0% that is indicating what it has decided is zero safe runtime left,.. its deciding based on various factors but it can fall out of calibration sometimes by a large amount. when it cut off from the drone, that also isn't 0% left..still probably extra 2% (or maybe more) above physical protection cut off left.
the idea about draining the batteries flat is that you get it to where the battery is low enough that the drone cuts off, dont have to try to trigger physical protection. just want smart protection telling the drone no more. then plug it in and let the battery juice up to 100% again, what this does is the circuit now recalibrates its end points, that way you are sure you have done everything in your power to let the smart system know how much real power is left. i dont suggest doing this alot, just every 20 - 50 flights let the drone land itself, sit doing nothing but blinking its lights until it shuts off from low power, then plug battery in, it should be good.. if the batteries were a little dumber like only have a basic protection board, then no, this wont help you, but dji batteries have a smart board inside that manages things in greater detail.
also with storage/hibernation mode when its self discharges, i highly suggest calibrating it before going on a long flight! plug battery in to wake it up and all but once it indcates it full fly it around you drain it down till it lands let it turn itself off, then pull battery..let it cool and plug it in... this is actually very important, because there is a few rare cases that the dji batteries coming out of storage mode have incorrect indicated votlages or percentages left and can potentially go critical early or free fall from protection cutting in and turning it off with no warnings..
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