Monthly Archives: March 2016

What exactly are the precautions for li-po battery?

What exactly are the precautions for li-po battery?

Based on the electrolyte components that happen to be utilized in Lithium Ion Batteries,Lithium Ion batteries are divided into Liquified lithium-Ion battery (abbreviation:LIB) and Polymer Lithium-Ion Batter (abbreviation:PLB) ,It utilized in the PLB cathode supplies and LIB is definitely the exact same, the anode components are divided into cobalt acid lithium, manganese acid lithium, ternary material and lithium iron phosphate material, negative exceptionally graphite, operating principle on the battery is nearly precisely the same.Their key big difference is that the different electrolytes, LIB making use of liquid electrolyte, PLB with strong polymer electrolyte as being a substitute for, at current almost all of the polymer gel electrolyte.

1.classification

strong

Sound polymer electrolyte of lithium ion battery electrolyte for the polymer that has a mixture of salt, the battery the ionic conductivity at space temperature is minimal, may be used at area temperature.

gel

Gel polymer electrolyte for lithium ion batteries is in solid polymer electrolyte including plasticizer as well as other additives, hence increase the ionic conductivity, the battery may be used at room temperature.

polymer

Polymer lithium ion battery owning a thin form, and of any area of ??any shape, and so forth., so you’re able to use plastic composite film manufacturing the battery situation, which may enhance the ratio with the entire battery capacity; polymer lithium ion battery can also be large molecule as cathode materials, its high-quality is going to be enhanced by more than 20 percent much more vitality compared to the current liquid lithium-ion battery.

2.Don’t charge overcharge

Polymer lithium-ion battery, if the charging time is as well lengthy, will boost the possibility of expansion.

3. Benefits and disadvantages Advantage

A. single battery voltage as much as 3.6v ~ 3.8v one.2V voltage is a great deal greater compared to the nickel-metal hydride and nickel cadmium batteries.

B. capability density, and its capability is 1.5 to 2.5 times the density of nickel-metal hydride batteries or nickel-cadmium 7.4v lipo battery, or greater.

C. Self-discharge, spot a very long time right after the reduction of its capability is modest.

D. Prolonged lifestyle, the typical use of the cycle daily life can reach in excess of 500 instances.

E. no memory result, prior to charging is not really important to vent the remaining capacity, easy to use.

F. Superior safety functionality

Polymer lithium aluminum versatile packaging structure adopted in the event of security complications arise, polymer batteries will not explode, it is going to only drums.

4. smaller thickness, can do thinner

Slim, the battery is usually assembled to the credit score card. Ordinary liquid lithium employing the initial custom shell, following the Cypriot village of constructive and detrimental material system, the thickness of 3.6mm or significantly less technical bottlenecks do exist, as well as the thickness of your polymer 2 cell lipo batteries could be finished 1mm or less.

5. Light excess weight

Utilizing a polymer electrolyte battery without having metal shell as safety packaging. Polymer battery bodyweight compared with all the similar capacities of steel lithium, 40% lighter, 20% lighter than aluminum battery.

6. The internal resistance

Polymer batteries internal resistance than ordinary liquid small core, the current domestic polymer batteries internal resistance of 35m can do even significantly less, drastically minimizing the battery through the power to extend the standby time, might be accomplished with the international level. This help big discharge recent lithium polymer is great for remote manage model because the most promising different to nickel-hydrogen battery items.

7. The form is often customized

Makers require not be limited to conventional type, it may be economically produced of appropriate size. Polymer battery is often added in accordance to customer demand or minimize the thickness of the batteries, the growth of new versions of batteries, cheap, mold cycle is short, and some can even be tailored according to the form of a cell phone to consider advantage in the battery housing area, improve battery capacity.

8. Superb discharge traits

Polymer battery with gel electrolyte, in contrast to liquid electrolyte, gel electrolyte acquiring a secure discharge traits and larger discharge platform.

9. Plate Style and design Very simple

Consequently of polymer materials, batteries no fire, no explosion, batteries itself has sufficient safety, so protecting the circuit style and design polymer battery might be considered omitted PTC and fuse, therefore conserving the expense of the 3s 1300mah lipo battery.

RC lipo battery in excess of discharge and the right use of purpose

RC lipo battery in excess of discharge and the right use of purpose

Some newbies believe that lithium batteries brand much better,ever the higher the value,it is actually far better to use the longer. But often not the case, even the top lithium batteries,over-discharge phenomenon will appear.

The way to make use of the appropriate of lithium battery?

No matter if lipo battery 3.7v or 1.2v NiMH,won’t mean voltage when the battery is thoroughly charged.For lipo battery 5000mah, the basic following complete voltage reaches 4.2v,I think most of the people have the mobile phone batteries universal charge,it output voltage is usually indicated above four.2v.NiMH full charge can reach one.5v. Furthermore to voltage,and then there exists capacity and discharge charge.the capacity from the battery in mah,the discharge fee is definitely an unit with C. In quick,1C for distinctive capacity battery just isn’t precisely the same. 1C discharge signifies that batteries can final for one particular hour. Example: 1500mah capability battery lasted 1 hour of function, the typical latest is 1500ma, namely one.5A,1.5A and that that is definitely if your battery 1C above the nominal highest 10C that the battery discharge recent is 15A… That may be under the battery 15A is safe to make use of. Again 1000mah capacity during the 1C is 1000ma, namely 1A. Should the over nominal 15C. Then the utmost discharge existing is 1A * 15 = 15A, the utmost discharge current of your battery is 15A. Nevertheless, the over perform the batteries 15A, 10C discharge is, in concept, the utmost latest function utilizing 60/10 = 6 minutes . And 1000mah operate to 15A, 15C is discharged on the present concept can be used to operate 60/15 = 4 minutes. So fairly speaking, 1500mah, 10C battery to get applied for any lengthy time points. So get the battery by taking a look at the amount of C is not acceptable. C modest number of discharged battery may well discharge a significant variety larger than C. Connected with this particular capability.

Remote manage model aircraft lithium battery identified as the lithium polymer battery, typically referred to as lithium or lithium batteries. I’ve to 11.1V lithium battery remote control model aircraft for example to illustrate ways to correctly use lithium battery. Commonly, 11.1V lithium battery of remote control model aircraft by 3 lithium batteries in series (gens ace 3s lipo), per piece batteries voltage is 3.7V. The lithium model, cell phones, cameras, etc. The nominal voltage is called marking voltage is obtained through the average working voltage. The actual voltage monolithic lithium batteries is two.75~4.2V, lithium over the subject of electrical energy capability of 4.2V to two.75V discharge obtained. Remote manage model aircraft lithium batteries have to be employed inside of the voltage assortment of two.75~4.2V. The remote management model aircraft lithium battery voltage is decrease than 2.75V belongs excessive discharge, lithium expands, chemical liquids within crystallize, these crystals may perhaps pierce the internal construction with the layer brought on by a quick circuit, make the lithium voltage gets zero. Remote control model aircraft lithium battery voltage is above four.2V belong overcharging, internal chemical reactions too extreme, lithium will blow growth, if it continues to swell charge combustion. No matter if it is over discharge or overcharge could have remote handle model aircraft lithium batteries produce lots of harm.

1.the charge

1-1 Charging present: the charging current have to not exceed the specs guide stipulated highest charging existing (underneath usual situations is 0.five ~ 1.0C or much less), the usage of greater than suggested charging existing may induce the battery charge and discharge performance, mechanical overall performance and protection effectiveness challenges and might bring about heat or leakage. At this time marketed 5C model aircraft battery charging current, charging is not suggested frequent use 5C, so as not to influence battery life.

1-2 charging voltage: the charging voltage shall not exceed the limit voltage (4.2V / single cell), four.25V charge voltage of each part on the highest limit. (Non-straight to enrich my information, this may perhaps result in overcharging the batteries, consumers utilize the battery on account of an error produced by the consequences).

1-3 Charging temperature: The battery should be charged inside merchandise specs prescribed ambient temperature array, otherwise the battery vulnerable to damage. Whenever they locate the battery surface temperature anomaly time (refer to the battery surface temperature exceeds 50°C), should really straight away stop charging.

1-4 reverse charging: Connect the battery optimistic and detrimental, non-reverse charging. In the event the constructive and negative reversed, we are going to not have the ability to charge the battery. Reverse charging the battery will likely be destroyed, and even trigger fever, leak, fire.

2.discharge

2-1 Discharge existing: discharge present might not exceed specifications specified highest discharge existing, high-current discharge capability will lead to the sharp decline inside the battery to overheat and cause swelling.

2-2 Discharge temperature: The battery need to be discharged inside of specifications specified operating temperature selection. Once the battery surface temperature exceeds 70°C, to suspend use until the battery is cooled to area temperature thus far.

2-3 over-discharge: over-discharge can damage the battery can’t be so single battery discharge voltage is reduced than 3.6V.

3. Storage

The battery should be placed in great storage environment, long-term storage battery (more than three months), it can be advisable at a temperature of 10-25°C in addition to a reduced temperature non-corrosive fuel environments. During the long-term storage 14.8v lipo battery each and every 3 months to retain the battery charge and discharge action and guarantee that every cell voltage within the array of 3.7~3.9V.

How to eradicate the battery memory impact

How to eradicate the battery memory impact

What is the battery memory result?

Should the 7.4v lipo battery 5000mah is nickel cadmium battery, long-term will not be complete charge and discharge,it easy to depart a mark inside the battery, the battery capability, this phenomenon is termed battery memory impact.That suggest, it seems that battery memory consumer every day charge and discharge rate and also the mode, time is difficult to transform this type of mode, can no longer do greatly charging or discharging.Lithium-ion batteries, no such impact.

The reason behind the battery memory effect

As a consequence of unfavorable extremely sintering type while in the regular approach, cadmium coarser grains, if nickel cadmium battery recharge prior to they may be absolutely discharge, cadmium grain conveniently gathered into pieces and make a battery discharge form secondary discharge platform.

Battery will retailer the discharge platform and it since the end of the discharge while in the next cycle, whilst the capability from the 3s 2200mah lipo itself is often make the battery discharge to the reduce platform.While in the method of following the discharge of battery will only keep in mind that low capability.The same in each and every use, any incomplete discharge will deepen this impact, make the capacity on the battery is reduce.

The best way to do away with the battery memory result?

To do away with the effect, you will find two means, one should be to use small latest depth of discharge (such as with 0.one C to 0 v) one is always to use substantial current charge and discharge (e.g., 1 C) quite a few instances.

In practice, the technique of elimination of memory effects have strict specs and an working system. Improper operation might be counterproductive.

For nickel cadmium battery, the upkeep of usual is deep discharge on the common basis: the common use for a month (or thirty occasions circulation) on the deep discharge (discharge to 1.0 V/each section, termed the exercising), widespread use would be to use photovoltaic cells or use the suggests including shutdown can cut down the formation on the memory result, but this is not work out, because the instrument (for instance mobile phone) is not used 1.0 V/only to turn it off each day, needs to be specific gear or line to finish the function, but thankfully many of nickel cadmium battery charger with this particular function.

For no nickel cadmium battery to exercising to get a extended time, as the cumulative memory effect, can’t reply in workout capacity, you then will ought to deeper discharge (named a recondition), this really is an incredibly modest existing for any extended time for each segment to 0.22.2v lipo battery discharge of the method, will need qualified gear.

For nickel metal hydride batteries, workout over the frequency of about as soon as every three months can proficiently relieve the memory effect. Since the cycle life of nimh battery is lower than that of nickel cadmium battery, with tiny recondition this approach.

Suggestion 1: every time there is no ought to charge the battery prior to discharge, and it truly is unsafe, mainly because ineffective shorten the life of the battery.

Suggestion 2: use a resistor connect could be the cathode on the battery discharge will not be desirable, can’t handle existing, simple to 0 v, even result in series of battery cell polarity reversal

How to charge of NiMH rechargeable batteries right

How to charge of NiMH rechargeable batteries right

With the rapid development of digital industry,NiMH batteries with the advantage of its benefits,environmental protection is more and more get the favor player and bulk purchases.use also from traditional small household appliances product:lamps,clocks,electric toothbrushes,etc and other widely used to our new products,such as digital camera,electric toys,RC and others.

As people is constantly increasing,the number of NiMH batteries using and maintenance of science is gradually taken seriously by people,As we all know,the brand the service life of NiMH batteries according to the official claimed that can charge up to 1000 times,actually this is an ideal value,often less than this life. But as long as reasonable use charger,more in-depth understanding of NiMH batteries,we will still be able to let her prolong life. Tattu(lipo battery 5000mah) warm prompt the following tips:

1_03

Under normal circumstances,the new NiMH batteries contain only a small amount of electricity,when you buy to recharged and then use.But if the battery factory relatively time is shorter,power is adequate,recommended use before recharging.

1.A new NiMH battery generally after 3-4 times of charging and use,in order to play to the best performance.

2.This is very important:although NiMH batteries memory effect is small,still recommend recharging after each use as far possible,and with a full-time,not a charge in a while and then filling in a minute.

3.?When the battery is charging, the charge should pay attention to the heat around the charge,Don’t put to much stuff around,keep the battery clean.This is to avoid the problem such as power loss,keep the contact point at the ends of the battery and battery cover interior clean.

4.Long time no use it ,remember to remove the batteries from the battery compartment ,put in dry environment recommended in the card battery box,to avoid short circuit.

5.The NiMH batteries not use in long time can deposit in a few months later, nature into a state of ”dormancy”?batteries,the battery life is reduced greatly. If the NiMH batteries(3s 2200mah lipo) have been placed for a long time ,it is recommended to use the slow charge for charging.

TIPS for your Drone Battery Care

TIPS for your Drone Battery Care

7.4v Lipo battery has now been with us for many years and have become an essential part of this hobby. They weigh 10%- 20% less than the typical NiCd/NiHm battery and they store nearly 350% more energy. However, they can aslo be fully charged in about an hour. All of this electric goodness does not come without a cost. If not handled and utilized properly, LiPo batteries can quickly become damaged or even catch on fire. So I am writing this in an attempt to explain how to best maintain your drone battery. And Of course, choosing a better battery for your drone is aslo essential in order to have maximum performance and life span. For me I’m now using Tattu for my drone, however it’s safer and more powerful than what I’ve used anyway.

Let’s start with the basics of the drone care. First of all , your storage environment should be clean and dry. Keep them out of contact with any random metal objects and at safe, non-extreme temperatures. Or what you need to do is to make sure they are properly encased and sealed when in your drone, preferably in a waterproof battery box, and then store it in a clean, dry place.

Your Drone battery must only be charged by specific chargers made to charge your drone battery.

As me personal,I am using Tattu 10000mah 6s 2 cell lipo batteries,You might use different brand,but the method is the same,Taking battery out of your drone before you charge your battery. OF course, make sure your battery does not put near any flammable products or liquids when you are charging it.

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Use the specific charger to discharge your drone battery. It can helps to stop discharging at a safe minimum charge level. As in my case,PL8 works perfect for my Tattu battery,Tattu 10000mah 6s as the best battery in uav area,so charger should be good enough to match it.

The other thing what you need to avoid is not to overcharge your drone battery.Generally speaking, the less that batteries are pushed to their max (that goes for charge and discharge), the more cycles they will provide.
These are tips to look after your drone battery. Better battery safety and longer battery lifespans, which in turn gives you a healthier wallet!

How Minimal Can a Battery be Discharged?

How Minimal Can a Battery be Discharged?

In our every day existence, whenever we??re making use of our electronic products, we may determine our mobile phones, laptops normally automatically powered off whilst you will discover still all-around 5 percent capacity left. Some reserve is generally left behind on goal after the tools cuts off. Why? There are several good reasons for this.

Most devices turn off once the li-ion battery reaches 3V/cell on discharge. The energy preserved is utilized for housekeeping, self -discharging, also as for decreasing battery pressure. In case the cells are more than discharged beneath 3V, this might do excellent harm for your battery. Once the the sells self-discharge lowers the Voltage of about two.6V(lipo 3s voltage), at which level most packs come to be unserviceable which has a common charger.

Energy equipment and rc pastime models draw high existing have a tendency to push the battery voltage to an early cut-off. This is often in particular obvious at cold temperatures and in cells with substantial inner resistance. These batteries may well nevertheless have ample capability left following the cutoff; discharging them which has a battery analyzer at a moderate load will usually give a residual capability of 30 percent.

To prevent triggering premature cut-off at a high load or cold temperature, some gadget makers may well lower the end-of-discharge voltage. Li-ion inside a power tool may perhaps discharge the battery to two.70V/cell as opposed to 3.00C/cell; Li-phosphate may well head to 2.45V/cell instead of two.70V/cell, lead acid to 1.40V/cell rather than the customary one.75V/cell, and NiCd/NiMH to 0.90V/cell as opposed to 1.00V/cell(22.2v lipo battery).

So that you can get less complicated to learn the status of your battery, wise batteries start to come out for men and women to greater protecting their batteries. This kind of as TATTU Plus, the functional clever battery for drone industry, can self-prevent from overcharge to above discharge.

Introduction to Lipo Batteries

When lithium batteries first reached modelers, they were just what electric modelers needed – a lightweight, high voltage battery with a high capacity. They quickly became very popular, even though it was equally quickly apparent that they require careful handling to avoid becoming damaged and even catching fire.

Lipo voltage

Lipo cells are nominally rated at 3.7 volts and are available in a wide range of capacities. It is absolutely essential that they are kept within a safe voltage range (no lower than 3.00 volts and not more than 4.20 volts) at all times. To ensure this is the case, they require careful charging and handling. Unlike nickel-based types, the consequences of mistakes with lipo cells are potentially much more serious and include battery fires, so safety issues are very important indeed with lipo cells. The very important topic of this safe voltage range is expanded upon in the next chapter. The table below shows the nominal, minimum and maximum voltages for various lipo batteries.

Inside a lithium polymer cell

Lipo cells are said to be of‘plate’construction because they are made up from a number of thin parallel-connected plates, similar to the thicker plates of the familiar car battery. This produces cells with a low internal resistance, so lipo batteries are generally well suited to high discharge rates. For the same weight as a nickel based battery, a 2S 5000mah lipo contains several times the stored energy.

Lipo cells are made up of three principal components; a cathode (positive plate), anode (negative plate) and separator. The cathode and anode are made principally from lithium, while the separator is made from rigid sheets of polymer soaked with a conductive electrolyte. These give the cell some resistance to bending. However because the case of the cells is simply a thin foil of metalized Mylar, they are easily damaged by impacts or other physical mishandling.

‘C’ Rating

Modern lipo cells are capable of very high discharge currents. Some cells are rated for a sustained 30C discharge which would exhaust the 5000mah lipo 3s in only 2 minutes. For a 2,500mAh pack this is equivalent to a continuous 75A – this is a very high current indeed.

Lipo lifespan (cycle life)

The nature of lipo cells combined with the relatively demanding modelling environment means they usually only have a relatively short cycle life. A good quality lipo battery if treated well could achieve 250+ cycles. This represents quite a lot of flying – that’s 5 flights every week for an entire year. If each flight was only 6min in duration, the accumulated flying time would exceed total 20 hours. Sadly many models never last long enough to accrue this many flights.

Lifespan definition

Some people define the lifespan of a lipo battery as when its capacity falls to 80% or some other proportion of its stated capacity. Depending on the way it’s used, this situation can occur quite soon. My own definition is a little more flexible – provided I am getting safe and reliable use from a lipo, I keep it in service. Whatever definition you choose, essentially the life of a lipo ends when it can no longer be trusted to provide you with the service and reliability you need for the application in question.

The Introduction about LiPo Hybrids

When first introduced, LiPo batteries were more expensive than Li-Ion because they are more difficult to manufacture. Fortunately prices have dropped substantially since they have become as, if not more popular than Li-Ion battery technology. This holds especially true for electric powered RC aircraft and the real driver behind LiPo battery research – portable communication/entertainment devices.

LiPo hybrids use the same flat cell structure as their dry counter parts meaning they have the same flexibility with sizes and shapes allo wing for very specialized shaped 2S 7.4v lipo battery packs perfect for use in our RC models.

Almost every RC LiPo battery cell is packaged in a foil pouch coincidentally called a pouch cell. The picture to the right shows a typical 2 cell LiPo RC battery pack.

Pouch cells are the perfect solution for building multi celled battery packs since the flat pouch cell can be stacked with no wasted air spaces like found within round celled 5000mah lipo 3S packs. Of course since LiPo’s use this light weight pouch instead of a metal can, less weight is the result making LiPo’s the best choice over Li-Ion in a weight conscious application such as RC aircraft.

If you ever open up a LiPo foil pouch cell, this is what you will find. A long piece of very thin plastic film (the polymer) with thin car boncoated anode and cathodes in an alternating pattern on the front and back side of the polymer film.

If you’re wondering what the burnt hole is in the center of all the cell folds, I purposely drove a nail through this cell to discharge it rapidly & watch the fireworks. The cell rapidly ballooned out, burst, and vented a great deal of flammable electrolyte but never caught on fire. On the positive side, if it would have burst into flame, I wouldn’t have this picture to show you the “guts”. I only did this because I dropped this heavy 6S 5000mAh LiPo pack on the hard concrete floor (yes -very dumb & costly butter finger moment) and one cell was damaged in the process. Lesson learned, don’t carry more LiPo’s than you can safely hold!

One interesting characteristic hybrid LiPo batteries share to an extent with their dry counterparts is they do get more efficient at ion exchange once warmed up. If you have ever noticed your RC model seem to gain a little more power a minute or so after working the battery; what you are experiencing is the increase in ion exchange efficiency once the battery chemistry warms up.

The Deepth Understanding of Lipo Batteries

Lipo batteries get a bad rap for being dangerous and unpredictable. The truth is that they are only as dangerous as you let them be and they are predictable enough for safe use once you are properly educated on them. As such the biggest problem with lipos is not the batteries themselves but the users. The next time you read about a lipo burning down someones house or car, remember it was not the lipos fault, it was the user of that lipo. With a basic understanding of lipos and the use of good solid equipment and practices, lipos can be as safe as any other battery type.

Lipo batteries have wonderful performance. Don’t let the voltage fool you, a 7.4 lipo battery will smoke a 9.6 volt nimh, even if the nimh has twice the mah. As I said before, the lithiums are very efficient amperage wise. If you are looking in the right place for a lipo, it’ll provide several numbers and letters that help figure out the performance of the battery in question. Let us take a lesson in basic lipo lingo, as it were. 2s means two lipo cells in series. Series wiring adds voltage. Parallel wiring adds mah. Here are some basic figures. 2s=7.4. 3s=11.1 (good only for highly upgraded guns, use at your own risk) 4s=14.8.

Mah in the lipo world. Don’t go thinking you should get a 3000 mah lipo for your gun. Sure it’d work but you don’t need it at all. I have a CRAPPY 2s 5000mah lipo that does much much much better than an 8.4 volt 3000mah nicd. Rate of fire and runtime jumped incredibly, even on a low quality battery, and at half the weight. In most cases, 2000 mah will be more than enough. Again, for the usual gun, a 15c continuous discharge battery will be plenty. If you are an aeg sniper pulling an m150 spring then you may want to back it up a bit with a 2500 to 3000mah, or up the c rating to 20 or 25c. A higher mah or c rating will give your motor extra umph. But take my word for it, if you are planning on putting a lot of work on your motor, get a good one, don’t cheap out on it. You could short out your motor, which will short out your battery which if you are holding the gun will shorten up your hair as it bursts into flames.

C rating. Now this part is math intensive and the example given is on a 2s 7.4 volt 1,000mah 20c continuous discharge pack. C rating has to do with charge and discharge in relationship to the battery’s mah rating. Continuous discharge formula: 1,000mahx20c=20,000mah-000=20amps safe discharge. Get it? Charge c ratings are very important. Almost all batteries will have a 1c charge rating. Simply charge at one c or less (1,000mahx1c=1,000mah-000=1amp). Lower mah charging is better for the pack, but also takes longer. In this example, set the smart lipo charger to charge at a rate of 1000mah (1 amp) or less and it’ll charge properly until it reaches 4.2 volts per cell.

As you can now see, LiPo batteries are powerful, practical, and potentially dangerous if not stored properly. Get the right kind of case or container, put these batteries in there, and follow the correct voltage and charge requirements and you will have nothing to worry about where LiPo battery storage is concerned.

Which Lipo is Better for A Fixed Wings Plane

I was giving one example between 3s vs 6s to make it simple for calculation however the reality will be between 3s vs 5s. Our motor can deal with 3s to 5s. For now we tried 2 x lipo 3s 5000mah. But we’re thinking to use 2x 5s battery 5250mah 25C instead. Because we’ll save 300g and we’ll get higher torque for the take off.

Our plane has 2 configurations: 1 pusher motor or 2 puller motor. The flying weight is 2.5kg without the battery if 1 rear engine and 3kg if 2 front engines without the batteries. We tried 2s lipo batteries with the one rear engine, The only issue that we have is the take off because when it is on the air, it was flying very easily. But we went to a hill to be able to do the take off. We were using the motor 550w 1000v with a 3 blades prop 10 x 7.

We know that it needs 2 motors for much better take off but as we all know that 2 motors will consume faster the battery means less flight duration. So we are thinking to use 1 engine for less consuming and more flight duration with a 5s battery to give more torque on the take off because when it is cruising no need for power.

If you’re able to get satisfactory performance from a 3 or 4 cell battery you would generally be able to get longer flight times from the reduced number of cells with the same weight battery as a 5 or 6 cell one. This motor is rated at 3 to 5 cell and if you don’t need the 5 cell for your takeoff requirements it will probably fly longer on a 4 or 3 cell one of higher MAH but the same weight as the 5 cell one.

Reality is you are probably going to want to try 3, 4 and 5 cell batteries and various props to see what will actually work best for you.