I haven’t seen any swells yet, but currently I only have two batteries. I do try to store them (as much as possible) at “3 flashes” on the charger – so 50% - 75% charge or so.
I haven’t found that exact nomenclature either, however – and this may be a false lead – there is a firm in China called Honcell (www.honcell.com) that has some lipos with a somewhat similar pattern, e.g. three letters starting with H, six digits, then alpha suffixes. Again, they may be completely unrelated, and making it more difficult this may be an OEM battery that wouldn’t even show online in normal searches.
By the way (and you may already be doing this), if you need to discard any of those batteries, I’d hold onto the section with the connector so that the possibility of wiring in other lipos would be easier.
Yea, my ballpark figure for long time storing is 75% so 3 flashes. I am flying the quad fairly regularly so not much chance of the LiPos just sitting around. Speaking of, I have to fly the second, the EX4, as well to give its LiPos a chance to unload.
I’m always surprised abouth the lightness used to declare some certifications.
Specifically, putting the CE mark on the box (but the same is for the FCC one) legally means that someone, either the manufacturer or the importer (i guess the importer here, since the unit has no stamp on it), can demonstrate that the product succesfully passed the required tests related to the operational safety and to the electro-magnetic compatibility.
At least for the European rules, I bet there is no technical way to deliver a 3 km R/C and video link range AND still being compliant to the RF spectrum regulations for this class of devices (unlicensed short range devices, SRD) operating on 5 GHz band with limited RF power output.
But the CE mark is there on the package.
I wonder if somebody cares about what is being sold and TAXED…
Sure, that is an accredited certification laboratory.
The unit tested shall obtain positive test results in order to get the CE certificate. I’ve never been able to find them (neither the certificate alone).
Guys, do you honestly think these chinese companies really paid the effort (technical and financial) to certify their low cost products?
…they don’t have tech support…do you really expect genuine certification?..c’mon let’s be realistic…
DF806 is not there and, anyway, FCC compliance does not mean CE compliance since regulations in USA are more permissive from the RF transmission power perspective.
If the EX4 Pro range is true, is 99% not compliant to European rules.
And there is no official evidence that either the standard EX4 could be compliant. It may be, but we don’t know.
Well as long as we don’t bring down any airliners in Europe or make the headlines with : “Drone pilot unknowingly hijacks passenger plane diverting it to a deserted military airfield due to 5GHz channels overlapping civilian ATC frequencies”
Jesting aside this could account for some of the crappy transmission and control ranges as well as some fly aways.
One issue is that we don’t really know how the Wi-Fi repeater in the transmitter works. It seems to be pretty much a straight pipe, but the power output of the transmitter vis-a-vis a typical phone has AFAIK never been actually documented in any kind of reliable way. And of course these frequencies are prone to all sorts of interference. Combine that with GPS glitches and of course you get flyaways. But this issue of differences between the standard version and the “3km” version is notable, since they are actually charging more for the latter, and if there isn’t a significant actual difference in the field that would be a problem.
From what has transpired so far regarding the 3Km version it seems that only the FC has the increased range, the video transmission is still a regular 5GHz WiFi signal carrying the RTS video stream so not much improvement there. From what users of regular 1Km model noticed the control-ability of the quad was seldom an issue, the majority of problems occurred due to FC going haywire, not due to loss of connectivity with the base station.
So I still think the 3Km version is just a suped up WiFi, probably a maxed power output WiFi module, probably done via software from the apparently Linux based repeater - either straight in the driver or via some configuration parameter when the wifi adapter was setup in the Linux distro - I’m assuming here as I didn’t have a look at either the board nor the software and Linux wifi adapter driver setup isn’t exactly my strongest point
Anyways, I never put any stock of faith in whatever certifications any of the chinese sellers on any of the sites showcased. Considering their “genuine fake” attitude, putting any faith in a “certification” shown by them is at best a sad tasteless joke.
LE: I’m not implying chinese manufacturers cannot deliver good quality. They can and do, but the cost of doing so is at best the same as getting the same level of quality from let’s say an European or US manufacturer. As always, the amount of effort (labor, materials, design, testing etc.) is the same no matter where a particular device is manufactured. Keeping the same level of quality while reducing unnecessary costs is how you’d lower the cost. Unfortunately the attitude from the start when chinese started mass producing whatever they could get their hands on and copy them was: make them many and make them cheap. Make it like it rains if anyone asks about copyright. And due to mostly greed whomever held the patent for that thing either turned a blind eye or struck a deal with them for likely a share of the profits. In time this proved to be a losing bet. Little by little the chinese amassed a large enough financial capital to take over the original owners of the patent.
I would note that Chinese dominance in these areas – almost without exception – has been achieved with the cooperation of the U.S., Europe, etc. When I hear politicians berating the Chinese with claims that they “stole” our manufacturing industries, I can’t help but laugh. U.S. firms searching for a better bottom line at the expense of everything else gladly sold their souls to China. Manufacturing moved to China. Taking massive loans from China. All done voluntarily, even gleefully. Like Pogo said, the enemy is us.
well said. thing is, we are where we are, not just because some idiots (read that Nixon moron) struck that lousy deal with the commie chinese in the 70s, now the manufacturing is there, the output of those zillion worker bees is incredible, the quality though is nowhere near what it should. a freakin’ nanometer scale electronic chip is supposed to work in certain conditions, if you cut corners just for the sake of the bottom line profit you risk (and this risk has materialized already) to have those crappy chips that wouldn’t make it in a critical system anywhere else be used to control nuclear power plants, electric grid, gas, oil, healthcare devices - imagine a drug dosing machine computing the wrong amount of flow for a specific patient because the Made in China CPU had a faulty math co-processor because the QA at the factory was laxed or non-existing.
And of course the chinese will never ever take any responsibility for that. They pretend they didn’t understand, invoke the language barrier when it suits them. Question is until then can this go on? At some point a critical amount of “stuff” will go boom because of this. I wonder what would happen if some of these chips in an AI-based machinery go berserk, or a quantum computer starts seeing an anomaly…I hope I’m just mumbling nonsense…
The problems of substandard and/or counterfeit parts (of course the risks involve everything from high tech chips to low tech bolts) are both complex and endemic. There’s talk of Intel perhaps building a new fab in the U.S. – but they’ve been as much a part of the problem as anyone else domestically.
There are no obvious answers. It’s difficult to see a practical path to large scale domestic recovery in manufacturing. American consumers are simply unwilling to pay the price premiums, and frankly the quality control in some cases domestically has been less than stellar – which of course gave rise to Japan’s dominance in tech beginning with Sony, et al. – and their fall as they also outsourced to save on the bottom line.
Adding to the mix is that Chinese customer service is often so much better than their U.S. counterparts. And the rise of incredibly rapid international shipping logistics (which seem to be just short of magic sometimes) is another factor.
