# Tag Info

6

The advantage of running at higher voltage is that you can use thinner wires and lower current (i.e. cheaper) ESCs, as power lost to resistance is proportional to current (squared) and not voltage. Another reason can be to reach higher prop RPM when you can't find motors with sufficiently high kV, or merely want to continue using the motors you already have....

5

As others pointed out, 16.8 volt is what that battery should be reading (unless there is a specific chemical composition that makes that different). Discharging a battery to use with your application is an anti-pattern, please avoid. Put a voltage regulator in there with the correct amp rating (draw) and you will be all set. Pololu has some 1-2a 12v step-...

4

TL;DR: You probably need to get a new battery pack. Your current one is likely at the end of its life. My guess is that your battery is just old and has reached the end of its useful lifetime. The fully-charged capacity, and by extension flight time, of all batteries decreases over time when charged and discharged repeatedly. This process is sped along by ...

4

Myriad factors contribute to the current draw of a drone motor including supply voltage, motor kV, the propeller geometry (i.e. diameter, number of blades, pitch), ambient atmospheric conditions, etc. One can make educated guesses and estimations of the current a motor will draw under known conditions, but the best and most accurate/reliable method is to ...

3

There are a few chargers with data ports but they may not work the way you want. These chargers have so many options that a remote interface would be quite complex, and the manuals often don't give much detail about the features available. Complex chargers always wait for you to confirm that it is set to the right type of battery before charging, and require ...

3

The capacity and C-rating don't tell you how long the battery will last, just how quickly you could discharge it if you really wanted to do it as fast as possible. It's perhaps analogous to the top speed of a car - just because your car can reach 120mph doesn't mean that a journey of 120miles will take an hour. Most of the time you'll never reach that top ...

2

If you know the current draw of your aircraft - which you can either calculate by adding each component’s current requirement, or measure with an ammeter - you can estimate the flight time for a given mAh rating with the following formula: $$Endurance = \frac{ 0.8 * Ah }{ AverageAmpsDraw } * 60$$ [source] Note - if your battery is labelled in mAh, divide by ...

2

It is probably easiest to charge the battery as normal, but reduce the voltage to your equipment. You could just add a diode in line with the battery; this would introduce a voltage drop of about 0.7V, plus give you reverse-polarity protection. If you can't modify the sensor device, you could add it in the power cable. Just make sure the current rating is ...

2

A LiPo reaching a higher voltage than stated on the LiPo is quite normal and is not actually "over voltage." Generally, when talking about a LiPo battery cell, 3.7v is mentioned because that is the nominal voltage of the cells. However, when fully charged, a LiPo cell should reach 4.2v. So for a 4s LiPo, 14.8v would be considered the nominal ...

2

Other than running high cell count batteries on low-power drones for the lols, there isn't much point in doing this, which will result in the throttle being SUPER twitchy and ultra-responsive to small stick movements without throttle correction. Increasing the battery cell count on a multirotor results in an increase in motor RPM because kV rating of the ...

1

I've had the same problem a while ago - I had two Robbe 6s LIPOs (4200mAh) and both had a dead cell. I'm afraid you won't be able to do anything to repair it - just buy a new LIPO from a different manufacture. It might be a bit risky to use a 5 cell 6 cell battery if your ESC is setup very sensitive (due to the loss of voltage).

1

I also dream of a recharging platform sometime in the future. I was thinking about having some sort of arm that would extend to the charging port on the station using some array of lasers, sensors and so on. But this is like a wet dream that I hope to finish by this time next year. Have a look at this. Or, if you like adventure, get any charger and hack it ...

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