20

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 electrons moving from the cathode to the anode through the electrolyte (which helps the electrons flow). The electrolyte decomposes over time, which results in ...


12

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 why you charge your batteries slower than you discharge them (i.e. to lower the risk of puffing and explosions, as well as to keep wear and tear low). During use,...


10

The most appropriate answer I could find comes from this study which states that a charged LiPo should be returned to storage charge if you do t plan to use it within the next 12 hours, and leaving it longer will cause a buildup of damage. The study is very interesting, though it may not explicitly answer your question I recommend giving it a read.


10

Low temperatures do affect LiPo batteries in a number of ways, first and foremost being the increase in internal resistance as the battery gets colder. This is why LiPos need to be warmed up before flying in cold weather, as otherwise they will be able to sustain a much lower discharge current than usual and will not give their full rated capacity: In ...


9

First is to discharge the battery to zero volts which can be done by using a LiPo charger or a light bulb. It can then be thrown into a recycle bin, but check with your municipality before doing so as some will not take them. There may be a local or regional centre where they can be dropped off. It is not advised to use salt water as it takes a long time ...


9

Only parallel-charge batteries with the same number of cells. Safe parallel charging requires that the voltages on individual cells be close to each other. A difference of 0.1V per cell is considered to be the maximum safe difference (I found it online, and have used ever since, although I have no scientific proof of that). One way to compare the packs ...


9

The short answer is that you don't want to run batteries below 3.0V ever, and ideally want to avoid large current draw below 3.5V. For a 3S battery, once you start seeing voltages in single digits (3.33V/cell is 10V, below that), it's time to land as a quick reference point - although you can set more precise values of around 10.6V as the warning point ...


9

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*1.3 = 104 Amps. There is no consensus as far as I am aware as to what the letter C stands for. It is worth noting that C rating is dubious - comparing the C ...


8

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 they aren’t often used for other purposes is that their current output is less than LiPo batteries. This means that whilst they are good for long range flight, ...


8

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 authority to land safely. You can go somewhat lower without damaging the cells, but at that point, the voltage curve starts to be very steep and it is ...


8

Charging Lithium batteries is a far more delicate process than discharging them because of the complex chemical processes involved. Batteries that are rated for tens of "c"s of discharge rate are usually only rated for 1-2 "c"s of charging rate. Standard charging rates are 1c for regular speed and 2c for fast charging, with 2c damaging the battery more. C-...


8

"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 logged and analyzed (I built an app for that). I read the other comment and that person knows their chemistry. I will try to balance that information with real world ...


7

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 half throttle. So, do you land any time full throttle goes down to 3.2V/cell, or when you are at half throttle and 3.2V/cell? Instead of relying on voltage ...


7

Yes, you can. The primary difference between LiHV and LiPo batteries is the ability to change them to ~4.35 V/cell instead of 4.20 V/cell with a nominal cell voltage of 3.8 V instead of 3.7 V. Just like how there's nothing stopping you from only charging your LiPos to 4.1 V/cell instead of their rated full charge @ 4.20 V/cell, there's nothing wrong with ...


7

Connecting the batteries in series or parallel brings two new issues with it that you need to consider before you start using them and they are both related to batteries that are not on the same charge level. If you put two batteries of a different charge in parallel, the battery with the highest charge will charge the other one and very high currents can ...


6

Firstly, I'll add the usual statement that mistreated LiPos can be dangerous and you are almost always better getting new ones. In some cases, a 'smart' battery charger will refuse to charge cells which have dropped between a certain (manufacturer-determined) voltage. In this case, you can connect the battery to a current limited voltage source and charge ...


6

Like the other answer, I couldn't find a specific, good study to go off of for any sort of real statement. The ones I have seen tend to be pretty low sample sizes and somewhat limited scope. What I did find that supported some experimental data directed at the type of lipos that get used for quadcopters was this: https://www.propwashed.com/lipo-storage-...


6

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 either, many larger commercial drones use combinations of packs in series and parallel to get the power source they need. For smaller quads though the ...


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....


6

You definitely can charge your 1205 mAh 6S LiPo at a current higher than 0.5A. For most of the LiPos we use on drones, the recommended charge rate is 1C, which for your battery, would be about 1.2Amps. (A 1C charge rate is 1 Amp for every 1000mAh) A 1C charge rate is a good middle ground, but you can use a lower charge rate (~0.5C) for safer but slower ...


5

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 to overheat, which may cause the battery to catch fire or explode. Commercial batteries from reputable manufacturers have self-monitoring circuitry that will ...


5

You should store the battery fully charged as little as possible; a few days is probably fine, but when it gets closer to a week or more you might start to see it's health degrading. That said, there is no hard limit where it will stop working, so my advice is to charge it when you are going to use it, and then charge / discharge it to 3.8 V / cell when you ...


5

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 It tells you that the specific 3000mAh cell tested there loses around 30% of its capacity when discharged at 2C, which corresponds to around 6A, which is not ...


5

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 cycles More stable chemistry, still dangerous but less volatile than Li-Po Almost no "self discharge", ready to go even weeks after charging Superior voltage ...


5

This question is difficult to answer without a few specifics. By ‘how long does a LiPo last’, if you mean when it’s on a quad, then usually around five minutes on a five inch quad. If you mean how long before it degrades, then that depends on a lot of things: How low do you run your batteries during flight? Lowering them to below around 3.3V can damage ...


5

How long is a LiPo battery usually supposed to last? Most LiPo batteries are not rated to last longer than 300 charge cycles. That is the battery fully draining and charging again. However, measuring a LiPo battery’s lifespan may not be practical, as batteries go through varying depths of discharge when they are used. Many manufacturers have stated that ...


5

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: LiPo storage voltage It seems that generally, the difference between storage charging to 3.7v, 3.8v, or 3.85v is negligible for most people. However, I would ...


5

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 process, however, is greatly sped up when certain things happen to a LiPo. These are the things that will cause noticeable "puffiness" in LiPo batteries: Over-...


5

The typical temperatures experienced across Europe shouldn't be a problem for LiPo storage; although depending on exactly where you are you may also want to check out this question: Do low temperatures damage LiPo batteries? If your storage location may be subject to direct sun then this could cause extra heating which may be harmful - think of a dark ...


Only top voted, non community-wiki answers of a minimum length are eligible