szh
lvl.3
Flight distance : 252139 ft
Germany
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HereForTheBeer Posted at 1-30 08:07
0.1 volts is the rule of thumb. Anymore than 0.10 volts and I would say it’s a cause for concern. Deviating typically increases with age and cycle count of the cells as internal resistance increases and excepted wear and tear occurs. If 0.10 volts deviating happens in flight it doesn’t mean your aircraft is coming down, but if your aware of it happening regularly, you should mark that battery that way you have a visual cue of which battery is wearing more. My Mavic Pro didn’t start having cell deviation as large as 0.10 volts in flight until around 130 charge cycles but I was more abusive than most people, using sport mode a lot, flighting to absolute limits, improper storage conditions (but not too severe) I basically treated it like farm equipment and it held up, but I also flew every day or every few days so it rarely sat around which apparently is how a lot of failures happen is people toss them in drawer at 100% for a month or two and come back to problems.
Your cells are fairly healthy if they only deviating 0.02 - 0.06 volts, but if you are seeing 0.15V deviation then yea, sorry.. that’s beyond recovery for 99.9% of people. as for how to determine if battery is going to age rapidly, few things. Regular deviations of 0.10V or greater during flight, large voltage sag during flights like if it’s 12V and then switch to sport mode and blast off for a second and drops to 10V that’s not great means battery can’t keep up with demand, and Finally, while flying around gently if your pack gets very hot, like 60C or over that means lot of resistance building up because resistance creates heat when demand is high..
Thanks for the response.
"0.1 volts is the rule of thumb."
My impression was that this is about the difference beyond which the drone refuses to take off (that's based on other complaints about similar problems on this and other forums).
My question wasn't really about when to stop using the battery. With such a deviation, the device would prevent me from using it anyway.
"Deviating typically increases with age and cycle count of the cells"
What I'd like to know is related exactly to this: what's too much for a new battery? If a new one has 0.05 already, I guess that means it will fail faster ... I don't know what mine looked like when new, but looking at old logs for the first time I can see that it has 0.05 V deviation already after 10 charge cycles, even though at that time I certainly did not push it hard (have not even tried sport mode yet, and I was generally careful with usage, maintenance and storage).
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