delfin2003
 lvl.4
Flight distance : 170869 ft
Russia
Offline
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Interesting video, but, don't treat it as a rule to go by. What I can say is this, it depends on the battery chemistry. In the given video, at around 2 min mark, you can see that the voltage under load is 3.4, but once the drone lands, it quickly recovers to around 3.8 volts. I would say that it is fine, it's a good indication that that the battery still has enough juice to feed the drone. However, it may not be the case with all the batteries. I have been flying RC for over 10 years, used all kinds of batteries, and settled with Pulse Lipo. The reason is, they hold voltage under load extremely well. You won't ever see a huge "bounce back" as you see in the video above. They will recover, but maybe to around 3.55 volts a cell (I would imagine), assuming I drive them low. I can't tell you how much P4 battery will bounce back, but I doubt it will be 0.4 volts, that's huge, but again, depends on the battery. Thunder Power RC lipos have a good bounce back, but they also experience huge voltage sag under load, which in my case, wasn't acceptable.
From a personal experience with drivng a lipo too low. I've driven two of my 6s Pulse Lipos to around 3.3 volts under load, never intended for it to happen, but it happened because I wasn't paying attention. After a couple of weeks I went flying, and once i landed my plane, battery was puffy. Same thing happened to the second battery as well. Could never balance it right after that. So the lesson was learned.
It's good that you keep them at storage voltage around 50%. It is how it is supposed to be. Ideal storage voltage for lipo is 3.8 to 3.85 volts a cell. They can be stored for a very long time.
I would still strongly advise anyone flying their drone to not drive them below 3.7 volts a cell when landed. |
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