Compared the polymer battery with the liquid Lithium-ion battery

Compared with the liquid Lithium-ion battery, Lipo battery adopts the thinner aluminum film and the different production method. The thinner the polymer, the easier the manufacturers produce. The battery whose thickness is less than 0.5mm can be produced in theory. Opposite, the thicker the liquid Lithium battery, the easier the manufacturers produce. It is quite hard to make the battery whose thickness is less than 4mm, which has weakness in the capacity. Therefore, the thinner the batteries, the less cost the polymer production has and the more cost the liquid production has.

For the thick specification, the liquid Lithium battery has complete supply chain and technology, high production efficiency, high rate of finished products and cost advantage of manufacture. From the market, though the battery of 5,6mm in thickness has more capacity than the battery of 3,4mm, the 5,6mm battery has lower price. In theory of polymer, the material cost of 5,6mm battery is similar to that of liquid battery. However, nowadays, the process cost is much more than the liquid one. Therefore, there is some gap to form competition between polymer battery and liquid battery from the specification.
Among the recent polymer Li-ion battery, polymer materials are mainly applied in anode and electrolyte. The anode materials include macromolecule polymer or inorganic compound adopted by normal lithium battery, and the electrolyte can use the solid, colloidal macromolecule electrolyte or the organic electrolyte. The cathode always uses the Lithium metal or Lithium-carbon interlamination compound.
The liquid or colloidal electrolyte puts much weight and cost on the Lipo battery and restricts the flexibility of size. However, there is no extra electrolyte in the Lithium polymer technology, so it is more stable. That is to say., there is unlikely to cause danger if the battery is overcharged, punctured, collided, overused and destroyed in other ways.

The new 5000mah Lipo battery has stronger flexibility to meet the products' demand, since it can become thin in shape (0.8mm for the thinnest one), area normalization and shape normalization. To make battery of any shape and capacity provide the manufacturers with the flexible design and adaptability to optimize the performance. At the same time, the unit energy of lipo battery increases by 50%, and other aspects have improvement like capacity, characteristics of charging and discharging, safety, the range of working temperature, cycle times (more than 500 times) and environmental performance. Gens ace 2s lipo battery has a long lifespan,it is better than others.

Lipo Battery strengths:

1.Ultra-thin
2.Flexible: manufacturers can adjust the volume economically rather than the fixed shape.
3.Light: Polymer electrolyte battery does not use the metal cover as the external package.
4.Safety: the electrolyte is unlikely to leak, so it is more stable.Like as the Tattu lipo battery.

Shortage:

1.Compared with Li-ion battery, the Lipo battery has weakness in energy density and cycle times.
2.High cost
Source:http://www.genstattu.com/blog/compared-the-polymer-battery-with-the-liquid-lithium-ion-battery/

Why the Consumer UAV So Popular?

The history of UAV can be traced back to last century. But recently, with the release of consumer UAV, it is not merely for the upper-class but becomes an affordable "toy" for all the public. The popularity of UAV should be attributed to the joy and operability. When you turn on the aerial photograph mode, you could observe the surroundings through FPV (First Person View), which is a totally new shooting perspective and full of fun. Besides, it is easy to operate and control, especially for the green-hand.
The design of multi-rotor, flying with four or more rotors, is massively adapted into the consumer UAVs, which is the simplest mechanical structure among the three types of aircrafts andis motivated by the motor,and relatively the UAV battery is light weight and long flight time. It has the obvious advantages of simple machinery, being able of taking off and landing vertically. However, the multi-rotor has the comparatively short flight time and less payload.

The quadcopters and multi-rotor UAVS gain the most market, which are lightweight, agile, safe, easy to operate, able to hover in the air and other strengths. The multi-rotor UAVs gradually turned the toy plane into the pragmatic aircraft for aerial photograph. You could see the synchronous picture as long as you connect the UAV with Wifi. Similarly, in the actual flight, you could watch the UAV or the screen. Apart from aerial photograph, the UAVs have been applied in express delivery, disaster relief, patrol, providing network and other fields.

What is the difference between consumer UAV and professional UAV for aerial photograph?

The consumer UAVs commonly have the affordable prices for ordinary people, varying from one hundred to thousand dollars, light weight and operability. For most consumers, the main purpose of consumer UAVs is entertainment. Conversely, to operate the aerial photograph UAVs, people should experience the professional training. Another advantage, especially important for the green hand, for UAVs is that it does not need to assemble by own, which means that we could fly as soon as we buy it.
The aerial photograph is the main function of the consumer UAVs, but it still has great disparity with the professional aerial photograph UAV from the image quality, flight duration, the ability of withstanding bad weather, high-speed of image transmission and other perspective. The professional one could load with professional digital camera, whose image is more clear and has higher pixel. Naturally, the professional one has higher price, from ten thousand to hundred thousand dollars.

In a word, due to the easiness of operate and no need to assemble, the green-hand can control it skillfully after a few practices. And it has a lot of designs of one-touch operation, such as return and land automatically. Also, the price is much affordable for ordinary players.

Why we cannot buy the cheap drone?

It is undoubted that all the UAV fans want to have an own UAV, but the equipment of well-known and mega brand has the price of thousands dollar, which is not affordable for most of players. Therefore, some people will buy the cheaper UAVs, maybe tens of dollars. But is it wise to buy such drones?

To answer such question, the first thing we should clarify is whether we need a better fly experience. The experience depends on multiple factors, and the safety is the most crucial thing. We should choose those qualified products to guarantee safety; however, the cheap UAVs commonly do not have the function GPS stability, resulting in the difficulty in controlling and the instability. When the emergency happens, it cannot hover in time and is likely to cause danger. At the same time, the cheaper UAVs do not have stable holder, which can rotate, so that it could not shoot the steady images. Furthermore, the difficulty for fly improves without the function of image transmission. (It is impossible to see the picture.) Consequently, choosing a safe and stable drone, no matter the price, is wise for all the UAV fans.

Is the multi-rotor UAV easy to operate?

Take Xiro explorer, a quadcopter UAV, as an example; it is mainly operated by the rocker. The left rocker can control the height and direction (up or down and rotate). The right one can control the movement of four directions (forward, backward, left and right). The position can be set manually. The rocker of remote-controller is more sensitive, so we should carefully and slightly operate it to fly stably.

Xiro explorer have the function of GPS emergency hover and making a return. After you choose the landing position, only by pressing one button that it can land steadily. Hint: the landing position should be chosen cautiously. On one thing, do not land on the crowd in case of causing injuries; on the other thing, choose the spacious and smooth place to avoid the damage of drones. In a nutshell, it is easy to operate, but to shoot high-quality image, more time given to practice is needed.

What should be noticed to fly UAVs?

Though it is easy to control and operate, we should know more about the safety common sense, and certainly, the basic operation process. To avoid the air crash due to the power-cut, 14.8V Lipo Battery from Gens ACE is strongly recommended, for it has long flight time, easy to assemble and stability. Additionally, setting the prohibited fly areas is required. The flyers should pay attention to the rules and laws, apart from enjoy the drones.

Contrast to select different of RC car power

According to the motivation source of RC car, which is divided into two kinds. One for motor drive electric RC car, another for two-stroke air-cooled engine driven oil move RC car, and according to the fuel oil motor car, divided into gasoline car and methanol. We will make simple analysis according to the basic configuration and the advantages and disadvantages of each characteristics of the dynamic, to help beginners have a more intuitive understanding of the different of RC car power.

The first kind:Electric remote control model (Electric Powered), referred to as EP.

Electric RC car

Electric RC cars use lipo battery as power, output power to the motor, through the gear, the power transmission to wheels, a driving force for vehicles.
 
Basic configurations of electric RC car including as follow: the RC car, charger, controller and Gens ace 5000mah lipo battery.
 
Electric RC model car is the best choice for beginners, has the following characteristics:
1. The electric car has small inertia, easy to grasp, when you go on the road, beginners don't need too much set-up like a gasoline.

2. The electric car do well on linear output, the weight is lighter than gasoline, so the traction manipulation is flexible, corner speed higher than that of gasoline, if is the venue for many corners, short straights, laps of the electric car is faster than a gasoline, and the electric car start up speed, speed curve, linear speed is not lose oil.
3. The car don't have to repeat purchases, fuel investment, only need to install the RC car battery can be on the road, being recharged reuse, environmental protection free from contamination.
4. The electric car is not a nuisance, quiet street, don't be afraid to fry them anymore. This is the most significant characteristics of RC car batteries lipo

The second: GP remote control model car(Gas - powered) , hereinafter referred to as GP, block is divided into gasoline car and methanol.

Gasoline RC model car

The structure of GP RC Car is very close to the real car, gasoline vehicles using the two stroke gasoline engine.
The basic configuration of GP RC Car are: car, controller, gasoline, oil, oil pot.

GP RC Car is a beginner's second choice, has the following features:

1. GP RC car has simple structure, high strength of the frame, the damage rate is low, stable performance and easy maintenance.

2. The engine is simpler to set-up, the set range of oil needle is small, for beginners ,you don't have to often emphasis on set-up the vehicle.

Most engines of GP RC car are installed on the central of frame, the vehicle's weight is located in the central after partial, and that are the same as most of the super sports car in the world's center of gravity location , so the manipulation of the GP car is flexible , speed is fast, walking stable.

In the petrol car ratio majority with 1:8 and 1:5. Itself weight and volume is big, the request to walk on the road is no demanding as small proportion car so , what's more, four-wheel can independently suspension and gasoline vehicles, large hydraulic shock absorber, makes the strong ability of block pavement through.

Gasoline engine of a GP remote control car can use avalanche to describe, listened to the blood boiling, frying street tool. Here also remind all beginners must go to special field or unmanned broad areas to play.

Methanol RC model car

Methanol RC model car also use two-stroke air-cooled engine.

Basic configuration of methanol RC model car including: car, controller, synthetic fuels, igniter.

Methanol RC model car is the third choice for beginners, has the following characteristics:

Compared with gasoline, methanol car can do a smaller engine , as a direct result of vehicle size can be smaller. Gasoline vehicle general size for 1:8 and 1:5, and the size of the methanol car can do 1:18 size. Due to the weight an d volume of methanol car are smaller than gasoline vehicles, and higher speed, so the methanol car than gasoline vehicles speed is fast, more violence. Compared to the tram, methanol has more momentum and simulation engine.

Because the oil needle set-up is more complicated, methanol is not only expensive, but also inconvenient to buy and methanol engine life without long life as petrol cars and trams so the recommended novice firstly is trolley and gasoline vehicles, to have certain experience in RC model before thinking of methanol car.
 
Summary: By comparing, I believe you can have a further understanding to choose RC car power, hope everybody can have fun on RC car!
Source: http://www.genstattu.com/blog/contrast-to-select-different-of-rc-car-power/

Battery-The modern life necessity

An electric?battery?is an energy conversion and storage devices?that convert stored chemical energy into electrical energy.?

With the fast developed science and technology, improvement of human living standards, more and more variety of new features, high-tech electronic products are widely used to humans.Correspondingly,it will promote the arising of all kinds of different appearance and performance batteries.

The big brand such as Nanfu battery,GP battery,Panasonic and so on are known by people.Another 2 big brands have attracted worldwide attention with their excellent quality,innovative style and performance-Grepow and ATL.

Shenzhen Grepow Battery Co.,Ltd is a professional R&D,design,manufacture and selling company.From the establishing year 1998,Grepow has changed greatly in its development.
Grepow manufactured and supplied Ni-Mh battery from 1998 in a large quantity with its stable quality,reasonable price and perfect service.It is a kind of no-pollution,no cadmium new green energy battery widely used in areas like civil life,cars,toys, telecommunication and so on. We recommend NiMH for applications where a device has already been designed to use AA type batteries.

This batteries,?however,?have a short?lifespan,heavy,low discharge rate,and low voltage characteristics,so Grepow update to manufacture 2200ml Li-po battery from about 2009.

With a professional R&D team,and extensive experience in manufacturing battery, excellent technical documentation and advanced processing management system,Grepow’s 2 big brand Li-po battery-Gens Ace and Tattu are greatly known and used in RC ans UAV.which ensures battery’s consistency and stability in mass production.

Gens Ace batteries are very useful for embedded electronics. They offer the highest density readily available on the market. Because cell phones predominantly use this battery type, they are easy to find for reasonable prices. They?do?require special charging, so be sure to use the right charger for the job.

Gens Ace LiPo batteries cell has a?nominal voltage of 3.7V. When fully charged you will see nearly 4.2V on the cell but it will quickly drop to 3.7V under normal use. When depleted, the cell will be around 3V. This means your project will need to handle various voltages if you are running directly from a cell. If you need 5V you will need to combine two LiPos in series to create a 7.4V pack（2s 7.4v lipo battery） and regulate down to 5V.

We recommend Gens Ace LiPo for nearly every portable application like helicopter,RC,jump starter and so on.They are fairly robust and when used safely provide a great power source.
DJI-the world market leader in easy-to-fly drones and aerial photography systems,adopts Grepow’s Tattu battery to control its famous UAV.With the advantage of professional R&D, humanized?service,mass production capacity,amzing explosive power,Tattu is widely used by other big brand GoPro,Panasonic,LG and so on.

In the future,Grepow’s Tattu will be used in more fields and Grepow will pay attention and be allergic to more potential development trend and supply better bettery or other amzing products to the world.

Discussion About Lipo Battery Internal Resistance

IR is a window to the inside of your battery and tell you the overall battery health. It wilt el you how strong or weak it is, how it will perform, and when your battery is sick and dying in need of replacement. OK for Ri to be useful you have to establish a Baseline Reference. To do that certain conditions have to be met in order for the readings to be meaningful and useful. All that means is we are going to start with a new battery, fully charged, well rested, at a specific temperature like room temperature. Don’t worry if the battery is not brand new, you can still do this, it just will not be as meaningful starting with a tired battery because you will not know what it was when at peak or new condition.

A new battery contrary to what you may have heard needs to be broken-in by a few gentle charge discharge cycles. By gentle I mean 1C charge/discharge rate. Take your new battery and fully charge it up at 1C allow it to rest to come to room temp, measure the Ri with your charger, record the reading. Now discharge it down to 3.2 vpc and note AH capacity. Recharge full, rest, measure Ri, and repeat a few times. What you will notice is the Ri will slightly decrease and stabilize, and the AH capacity will slightly increase and stabilize. This is your Baseline Reference of when you battery is new in 100% tip top shape.

How to Measure Internal Resistance in Packs

If you have, for example a 3s 11.1v lipo battery, you need to load it to a couple values to get an accurate internal resistance. First you need to put a relitively small load on the battery, around 1C, and measure the actual current from the battery and the actual voltage across the battery. For a 3-cell 1000 ma battery, you would need to use a load with a value of around 12 ohms. Since the voltage of a freshly charged 3-cell Li-Po is about 12 volts, a 12 ohm load will pull about 1 amp which is 1C for a 1000ma battery. The load will need to dissipate at least 12 watts, so you would need to use a resistor rated for at least 20 watts to keep it from overheating.

Lets say that this test gives you a voltage of 11.20 volts and 0.98 amps of current.

Next you want to load the battery close to it's maximum C rating. To load our gens ace 3s lipo 1000ma battery to 10C we would need to pull 10 amps, since the 3-cell battery loaded down this much will probably have a voltage of around 10 volts, it would take a 1 ohm load to pull 10 amps. 10 amps at 10 volts is 100 watts, so it will take a pretty big resistor to dissipate that much heat. Again you will want to measure the voltage right at the battery and the current being pulled from the battery during this test.

Let's say that in this test we measure 9.97 volts and 10.11 amps. Now that we have these 2 data points, we can calculate the internal drop of the battery and calculate the internal resistance.

The difference in voltage between the 2 tests is 11.20 - 9.97 or 1.23 volts. The difference between the current in these 2 tests is 10.11 - 0.98 or 9.13 amps. Now using Ohms Law, we can calculate the resistance. In this case it would be the voltage difference divided by the current difference or 1.23/9.13 which equals 0.1347 ohms for the entire pack. Dividing this value by 3, since there are 3 cells in the pack, yields an internal resistance of 0.0449 ohms or 44.9 milli-Ohms per cell.

Does LiPos with Higher IR Affect Capacity?

The internal resistance (IR) will not affect the capacity of the pack but rather its capability to deliver at higher rates. Well, here is an example for you. You have a 1000 gallon water tank with a 3" drain valve (low resistance) and a 1/2" drain valve (high resistance). You use this tank to water your 20 horses. The capacity of the tank remains 1000 gallons regardless of which drain valve is open but the 3" valve can water all 20 horses simultaneously while the 1/2" valve can water only 1 horse at a time. Obviously that is not a technical description and there are dozens of factors and exceptions to every rule but that is it in a nutshell without all of the technical jargon.

I have tested one pack that was identical in weight to a "standard" 3S 2200 that delivered over 2800mAh at very high rates (approx 30C) BUT it got very hot.

The verifiable fact is that the IR of LiPo packs will vary enormously with temperature and different packs have different curves. And they may cross. One pack that is physically identical in size and weight to another can have an IR that is much higher at low temperatures (say 20˚C) than the second but that is significantly lower at high temperature (say 60˚C). Yet at the same time their capacity is identical over a range of discharge currents.

Most decent higher capacity and higher discharge rated LiPo cells will have roughly 2 to 6 milliohms (0.002 to 0.006 ohms) of internal resistance when brand new. To calculate the total internal resistance of a series wired pack, you would then add these numbers together so a 4S pack with each cell having 4 milliohms of resistance will show a total internal resistance of about 16 milliohms (0.016 ohms).