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Usually you ca't but don't forget to include a warranty you get with new and a that used ones often can come with a LOT of accessories that would cost a pretty penny new. Especially if the quad is in like new condition so that the batteries are your only real concern. A lot of variables...

Check that the screws are not touching the coils on the stator. Sadly this is what it sounds like. Also check that none of the wires on the motor feel oddly loose like they could have broken off in the insulation back inside the motor. If this is the case you'll likely need a new motor...

Sorry to say but there is no real metric. Camera wuadcopters tend to retain value better simply because they go through lighter usage. Batteries loose value fast because you are ALWAYS taking a risk on them, racers more so than camera platforms again. Depends on how used, how bad the...

In general yes, CCD does not experience jello as bad. Downlink in the link down from the vehicle to the ground receiver, n this case the video link. Check out my previous reply, I edited it to include a lot more info and some pictures.

It would be if your downlink could handle the quality, however I'd guess that the video downlink will be your bottleneck if you don't have good signal. When you have good signal you would probably notice it. As for a wider or narrower view, that will be affected by the camera lens...

What type of power are you using? A lot of people like the TUrnigy Graphene and I have a collection of the Tattu 45c, 75c, and R-Line batteries. They do great for quadcopters, popular for racing too.

You could replace just that cell, but then it is never going to balance with the other two being the lower ones as the whole battery was damaged, one cell just took the brunt of that damage. Sorry to say but sometimes you just have to replace them.

Are you sure that you are selecting the correct port? Also sometimes you have to disable driver signature enforcement to install drivers.

Should be around 4v per cell. Probably a 1S battery so 4-ish but no lower than 3.7v. If the battery were older or over discharged it could easily be dropping really fast.

Generally the ESCs on a brushed boar are integrated into the FCB, or are as simple as a little transistor. Designs vary a lot.

Do you have a multimeter or a was to test that the battery really charged? Some won't arm on a low battery. Also are you setting it on the ground when you do the up and then down with the sticks?

Any numbers anywhere? Looks like a reproduction.

Might be that vibration could break solder joints and it be more vulnerable over time? Though I've found that bad soldering breaks early on except in relatively rare cases. Never heard of any type of limit, however I've noticed that a board that has 100 flights is usually going to be more...

Is it for sure running librepilot and not something else like cleanflight? Also do you see it in the device manager? Usually selecting the wrong COM port is common problem as well so I'd verify that you are selecting the correct one.

Found a video that might help BTW, it still makes sense at 1.5x speed

Sounds like PIDs for drifting, though the need to be rebound causes concern for the receiver too. Certainly odd. Does the drift get worse over time, or does it correct and start drifting the opposite direction? Are the receiver and flight controller combined to a single board?

Post away. Generally as long as no harm comes and you are not posting links to your product in an annoying way as your only purpose you are fine. Forum rules More rules regarding vendors

Yeah, it needs power, and you can reset it to its original configuration after binding.

THe bind plug usually shorts the signal to ground. You will still need to provide power to the receiver through one of the open ports. Make sure you are doing that, especially if your ESCs are OPTO.

Sorry about the delay. Motors, ESCs, and props For the motors I'd suggest ~2300kv, 3S to 4S, for a cheaper build you should be able to get by with some 15amp ESCs or even a 4-in-1 ESC depending on your motors you could go lower or higher, I'd go with a 5'' 3 3-blade set of DAL props, or...