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22 votes
Accepted

Is it safe to fly LiPo batteries after they get "puffy"?

You should dispose of them. A LiPo battery has three parts: the anode (negative plate), the cathode (positive plate), and electrolyte (sandwiched in between the two plates). Electricity is formed by ...
gparyani's user avatar
  • 414
12 votes

In what situations do puffy batteries pose a risk of ignition?

The risk of a puffy battery exploding during storage is still comparatively low, you shouldn't underestimate it however. During charging the risk of explosion is at its peak. This is also the reason ...
Bastian Springer's user avatar
11 votes

Is it better to have a bottom heavy quadcopter or a top heavy quadcopter when it comes to a quadcopter stability?

It depends on what kind of stability you're after. Nicolas Petit wrote a paper on this several years ago, the graphics below are taken from Pages 4 and 5. The summary is that a higher CG is better ...
Kenn Sebesta's user avatar
  • 1,912
11 votes
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How do DJI drones achieve such long flight times compared to traditional FPV drones?

There's no magic technology, it's just a difference in design goals. FPV drones are designed for speed, performance and robustness, DJI drones are designed for duration and carrying a gimbled camera. ...
Robin Bennett's user avatar
9 votes
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What does the C rating on a LiPo battery mean?

The C rating is a multiplier that dictates discharge. You can figure out the maximum theoretical discharge by multiplying the C rating by the capacity. For example an 80C, 1300mAh LiPo can output 80*1....
Drones and Whatnot's user avatar
9 votes
Accepted

Why do higher voltage batteries need lower KV motors?

They don't necessarily, however a given amount of power will be required to rotate a motor at a certain RPM with a given propeller. kV, the voltage constant of a motor, is the maximum RPM it can turn ...
Brydon Gibson's user avatar
9 votes

In what situations do puffy batteries pose a risk of ignition?

"Puffed" batteries are both more and less dangerous. I am drawing from over 10,000 FPV flights where I beat the mortal sh*t out of lipos and also from over 3000 battery charges I have ...
FunHog.me's user avatar
  • 1,068
8 votes
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Alternatives to LiPo batteries

Many people choose to use Lithium Ion batteries on long range builds. They have a very large capacity and I have seen them give in excess of 20 minutes of flight on a quadcopter. The reason that ...
Drones and Whatnot's user avatar
8 votes

At what per-cell voltage should I land?

I start my landing approach when the average cell voltage reaches below 3.5V on a stable flight (not counting voltage dips on short, aggressive maneuvers). At that point, you should still have enough ...
abacs's user avatar
  • 111
8 votes

How to revive an over-discharged DJI Mavic battery?

Short answer. Buy a new battery. I heavily researched this and although there may be another solution I will share my experience. The Mavic batteries have complex circuitry in them to maintain ...
cliffclof's user avatar
  • 423
7 votes
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What happens when a multirotor runs out of battery mid-air?

Assuming that you ignore all of the warning signs that your battery is low, while also assuming that you can completely deplete the voltage in your battery, the drone will ultimately reach a point ...
Schome1's user avatar
  • 1,226
7 votes

At what per-cell voltage should I land?

I have found that landing based on voltage is inaccurate. For example, if you look at the voltage in the OSD while you have the stick at full throttle, the Voltage will be lower than if you had it at ...
Schome1's user avatar
  • 1,226
7 votes

What should I look for when choosing a battery for my multicopter?

When looking for a battery, there are a number of factors to consider: the voltage (or S rating), the capacity, the C rating, the type of connector, and the weight: Voltage You will often see ...
Drones and Whatnot's user avatar
6 votes
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What affects the total flight time for a drone?

I'd watch out for several factors: 1. Weight Drop any additional weight that you don't absolutely need for functioning. This may mean downsizing to smaller motors, which obviously means that you have ...
anonymous2's user avatar
  • 1,043
6 votes
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Series or parallel connection for drone batteries?

Batteries in series = add the voltages, ie two 3S 1300 30C packs becomes 6s 1300 30C. Batteries in parallel = add the capacities, as above you get 3S 2600 60C. There's no particular pros or cons for ...
strepto's user avatar
  • 356
6 votes
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Is there an advantage to having more LiPo cells in a low-power drone?

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. ...
Robin Bennett's user avatar
5 votes

Alternatives to LiPo batteries

Li-Ion batteries are problematic because they do not deliver the currents needed for FPV flying. Take a look at this diagram: https://batteryuniversity.com/learn/article/discharge_characteristics_li ...
mcenno's user avatar
  • 151
5 votes

Alternatives to LiPo batteries

Also take a look at LiFePO/LiFe chemistry batteries. https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery Some advantages are: More capacity per gram, meaning lighter weight 1,500 - 2,000 ...
McCoy Pauley's user avatar
5 votes
Accepted

How do I re-charge the batteries of my S49 drone faster when outside?

I couldn't find manual or just the specifications for this exact drone, but from what you wrote and what I see on the images it uses 1-Cell batteries charged with some USB adapter. You didn't specify ...
Nikita Pedorich's user avatar
5 votes

How to restore LiPo-powered aircraft that have not been flown for years?

You may need new batteries. When a LiPo battery fully discharges, thin whiskers of lithium metal form between the plates of the battery. Attempting to recharge the battery will cause these whiskers ...
Mark's user avatar
  • 686
5 votes

Is it better to have a bottom heavy quadcopter or a top heavy quadcopter when it comes to a quadcopter stability?

As far as I know, it doesn’t make too much of a difference in regards to flight stability because of something called the Drone Pendulum Fallacy, which describes how the drone rotates about the centre ...
Drones and Whatnot's user avatar
5 votes
Accepted

At what voltage per cell should I store a LiPo?

This question seems to be quite the debate in many places. However, the general consensus falls between 3.7 and 3.85v per cell. You can find a similar inquiry here: Storing at 3.7 or 3.85v and here: ...
Jacob B's user avatar
  • 5,802
5 votes
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Why do LiPo batteries get puffy?

All LiPo batteries face a process called electrolyte decomposition. This means that all LiPo batteries will produce oxygen, some carbon dioxide, and some carbon monoxide through normal use. This ...
Jacob B's user avatar
  • 5,802
5 votes
Accepted

What can I do with a LiPo whose balance lead has been destroyed?

If you're up for it, the fix you're looking for is to repair the connector with a new housing and new crimps (if the current ones are broken). Joshua Bardwell has an excellent YouTube video ...
ifconfig's user avatar
  • 5,998
5 votes
Accepted

LiPo battery power maximization

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 ...
ifconfig's user avatar
  • 5,998
5 votes

How do DJI drones achieve such long flight times compared to traditional FPV drones?

This is a good question. In short, While DJI drones certainly have a lot of engineering and design put into them, the way they achieve long flight times is no secret. The DJI drones' long flight times ...
Jacob B's user avatar
  • 5,802
4 votes

Why do higher voltage batteries need lower KV motors?

The primary answer has to do with the fact that the torque constant (Kt) is proportional to the velocity constant (Kv) of the motor. That means the amount of power it costs to generate torque increase ...
QuadMcFly's user avatar
  • 1,200
4 votes

Methodology and sources for obtaining the correct replacement batteries for low-end RC aircraft

Most low-end aircraft use small LiPo batteries (lithium polymer batteries). If you want to find a replacement battery you can look at the voltage and capacity of the original battery and purchase a ...
Jacob B's user avatar
  • 5,802
4 votes

What affects the total flight time for a drone?

All of the things you mentioned will affect flight time. Here is a synopsis: Batteries The batteries you use will have a very large impact. Firstly, your battery chemistry. Li-ion generally has a ...
Drones and Whatnot's user avatar

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