In the 2.5yrs I've been reading this forum, that one guy is the ONLY person ever reporting a failed charger that I recall, regardless if he was dual or single charging. It's likely he just a bad charger that would have blown regardless, IMO. For me it's always worked just fine. I typically charge my RC when it get down to 2 LED's, about half discharged, so the feared "extra stress" is nominal, and I'm more than confident it will continue to work just fine.
"Works" and concluding therefore that you know there is no harm in it is a quantum leap. It's not recommended by DJI, so DJI knows there is some potential for harm. It's stressing their charger unnecessarily. There is no harm whatsoever in following their recommendation not to do so. It's only a minor inconvenience to remember to put the RC on, only if necessary, after charging up the battery.
Yes as a matter of fact, I do use a crosswalk. First and foremost I’m protected in court if someone runs me over while in the crosswalk. Second, I don’t want to get a ticket for being lazy. Third, I like to promote good, like putting my shopping cart where it goes after I use it.
I think you missed the word "always".
True, and there's no harm to the convenience of charging both together. If there was a risk they'd print it on the charger with a clear warning if it was a problem. We all know they would do that, AND they would put it in the manual. It's such a non issue, they didn't even think about it, but they got so many questions about it, because they didn't think about testing it, that the "marketing dept" answered this question with a "safe answer", with absolutely no testing. Had they actually tested it they would have been able to answer this simple YES or NO question with a clear YES, or NO answer.
You are making a ton of assumptions in assuming there is no problem, supported by your having done it yourself, and no other facts to support it. That's like saying driving drunk is safe because you do it all the time, and they really didn't mean it when they said don't drink and drive, because you do it all the time. DJI has stated it isn't recommended. You do so at your own risk, and I cannot see why it is even necessary, other than you find it convenient.
Actually it's based mostly on the evidence is see, and my experience with power supplies, along with CE and UL compliance requirements.
It's an entirely moot point. Anyone who owns a P4 and a P4P already has at least two 100W chargers, and either a hub or a $40 multi-charger. I have all of the above. You will never ever need to simultaneously charge both the RC and a battery off the same charger.Actually it's based mostly on the evidence is see, and my experience with power supplies, along with CE and UL compliance requirements.
1. It's not in the manual anymore. It used to be in the P3A manual which came with a 55W charger, likely because it may have been an issue that they tested. It could have been using a older power supply standard, which changed in the US in Feb 2016.
2. It has worked for me for 2.5yrs with their 100W chargers, and the charger doesn't even get hot, about half the heat my laptop charger exhibits with a depleted battery.
3. DJI doesn't answer the FAQs "dual charge" question with a YES or NO answer. Why not? I presume they have practically no returns on chargers, so they didn't bother to test it. It's easier, quicker and cheaper to "recommend something" that's conservative rather than actually testing it.
4. LiPo chargers only put out maximum current during the first 10min to 15min of the charge cycle on a fully depleted battery. After that the current and heat from the charger continues to decrease gradually. Chargers will only put out what they are rated at. Working 100% for 10 to 15min is nothing compared to other applications that require more for hours.
5. The CE and UL compliance testing DJI must have done by an independent lab is very strict. If there was any problem using both outputs at the same time for their intended purpose, from a safety point of view, or a reliability point of view, the compliance lab would require the charger to clearly state to use Output 1 OR Output 2, and not both simultaneous. But there is no such warning on the power supply. There's no way compliance labs would let that go through if both couldn't be safely used for the intended DJI application. If there was a problem using both simultaneous, CE/UL compliance would mandate such a safety risk to be not only printed on the charger, but also in the manual to prevent dual use (similar to my post #70 shows). I work with compliance labs on stuff like this and they are very particular. They test things in every possible way you can imagine. They are very conservative to protect their reputation and liability. I'm 100% sure these chargers even have short protection to prevent fire or melt down if the either output were to short. It's very likely they also have heat sensors that shut down the charger if overheated, which is why there's no heat rating on the charger itself, because it's not needed. The charger simply shuts down if it overheats, just like a PC that throttles itself down if it overheats.
We all know DJI communications is lacking, no arguing that, right? This is just another example. It makes for good debate trying to guess the truth that DJI doesn't bother to reveal.
You guys can go ahead and follow DJI's FAQs recommendation to charge them separately, and the FAA's recommendation to fly VLOS. I'm OK with that.
You say you own a 3 charger hub? You don't need that either, but it sure is convenient, isn't it?It's an entirely moot point. Anyone who owns a P4 and a P4P already has at least two 100W chargers, and either a hub or a $40 multi-charger. I have all of the above. You will never ever need to simultaneously charge both the RC and a battery off the same charger.
Actually, the hub is a PIA. It does not keep the batteries plugged into it topped off. Leaving the batteries plugged into it has no benefit after they are charged, as they are considered disconnected, and will actually start discharging after the specified days selected for them, while still plugged into the hub! If you are traveling, I would rather have two chargers to charge simultaneously, rather than serially, for all my many batteries and my remote. You still have to go back to it for any second battery charging with a single charger, so why not take half as long? The $40 aftermarket multicharger is actually far better suited for your needs. You can simultaneously charge 3 batteries and a remote in the roughtly the same space as a single DJI charger.
