Category Archives: Series Strings

Do you know about Grepow Company?

Inheriting 20 years of superb battery workmanship, Grepow has been always upholding the idea of high class and quality optimization in production. With outstanding pairing process, safe and reliable raw materials formula, steady and smooth discharge curve, rigorous quality control system, advanced automation equipment, research and development of cutting-edge technology and innovation of workmanship from over 200 people high end professional engineering team, Grepow is the only professional high power battery manufacturer in china that can produce NIMH, Li-PO, LI-FE batteries simultaneously yet maintaining very high standard within the industry. Grepow product is being sold to more than 60 countries around the world. The company has also set up its U.S and German Subsidiary.

The two brands Geshi ACE and Gensace were launched against domestic and overseas RC model markets, and have received a huge amount of responses. They have became very well known brands among RC model fans both domestic and abroad. Geshi ACE and Gensace have been always maintaining the very fine quality and have also gained a very good reputation. With their safe and reliable raw materials formula, advanced production process and rigorous quality control system, Geshi ACE and Gensace have made the batteries that are beloved by many RC model fans. The RC heli/airplane batteries are famous for its high capacity, long flying time, steady performance, outstanding aero shooting results, rarely puffing up and good cycling performance; while the RC cars batteries are showing off its brave, fearless character with its high C rate, super low internal resistance, high explosive strength and strong power during races.

Tattu has been launched few years ago in order to meet the market’s need. It can be separated into Tattu UAV battery and Tattu FPV battery lines. Tattu UAV batteries are industrial made specifically work for UAVs. It overturns the concept of RC models, and it precisely meets the need of UAV flight. It is a high-end UAV battery line that was recognized by the UAV industry once it was launched. Tattu FPV battery line is aiming at providing batteries that are more suitable for FPV racing. Tattu FPV battery come with super high C rate, high explosive power, very strong power drive, safe and reliable features. It was quickly become famous among both domestic and overseas market. It is the first choice and most-recommend to FPV pilots all around the world.

The article source: http://www.genstattu.com/blog/do-you-know-about-grepow-company/

What is FPV and the basic introductory parts of FPV

What is FPV?

FPV is the abbreviation of First Person View, it is a device based on remote control model airplane or remote control cars equipped with wireless camera to transmit images, which can be controlled on the ground.

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The basic common parts of FPV are aircraft kits, antenna, video transmitter, video receiver, image display and storage, remote control, camera and others.

FPV basic introductory parts:

1. Battery:

FPV batteries are generally lithium polymer batteries because of its better comprehensive performance, such as large energy density, light weight, resistance to high current. Even though, FPV cannot fly in a long time in flight, most of them can fly about 20-30minutes. Therefore, for more fun when flight, buying several batteries is a good way to deal with this problem. I recommend the Gens ace & Tattu 1300mAh battery and 1050mAh battery for your FPV battery.

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2.Charger:

The Li-po battery for UAV is in series which means there are several Li-Po cell connect in series internally, so in order to have every cell charges fully, it’s advisable to choose a “Balance Charger”.

3.Motor, ESC and flying control system

The motor consists of brush and brushless motor, brushless motor is very common in photography UAVs, which is powerful and quality. The motor will transmit the power from battery to spin itself speedly and then drive propellers spin to fly. And ESC is the controller of motor, it will transmit the signal infomation of flying system to motor current. The current size through motor is the speed size of propellers.

4. OSD and GPS

The UAVs GPS system is also very important, because one-key return, fixed-point and fixed height, hover and other functions depends on it. OSD is also known as figure transmission, it is the most important in FPV. Cause if you want to really have fun, the delay degree OSD is pretty critic.

5.Remote control channel, handlers and unlock

The size of the remote control and handle feeling is not very important, instead whether the remote control button layout reasonable and complex or not. The remote control channel means the up and down (throttle size), left and right, front and back, left spin and right spin. Quadcopter need to have at least 4 channel to fly safely.

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6.Propeller

Currently, the most commonly used props are the self-tightening pair opposite props. Pilots can purchase multicoloured self-tightening quality props to make your UAVs look more cool. The UAVs flight follow the principle of physics, whose installation is also two opposite sides. It mainly offsets the rotation thrust of spinning to make UAVs get rid of the earth’s gravity and fly in the air.

Source: http://www.genstattu.com/blog/what-is-fpv-and-the-basic-introductory-parts-of-fpv/

Best uav battery packs for multirotor fly Long flight time

Are you looking for UAV battery packs for your multirotor X8 or X4 etc., but still confusing about which brand is the best one and most suitable for multirotor? For fly long time pls read ahead and you will find out the answer.

How to choose UAV battery packs

Yes, let us come back to this topic now. How to choose the best uav battery? Before that, tell me what do you really command. Here are some questions just need to clarify a few things. How long flight time do you need? How much current is flowing in a ciruit and at what voltage for your multirotor? How much carrying capacity do you plan to? After you choose one battery, you can use this calculator formula to calculate your flight time, flight times =(Battery Capacity * Battery Discharge /Average Amp Draw) * 60

For instance, you choose a UAV battery packs 16000mAh 6s, and calculate the average amp to be around 60 amps, make an assumption that 80% of battery capacity will be used, then the flight time is 12.8 minutes (Results vary from brands).

About smart UAV battery packs

What is smart battery? Smart battery management system (BMS) will smartly manage your battery. As every one knows, lithium polymer is delicate accessories and need the user take maintenance. Which brand is recommended? The Tattu smart 6S 22.2V 12000mAh battery pack is a great choice for large-sized aerial photography vehicles such as the DJI S800, S1000, Gryphon X8, OnyxStar. This battery packs a ton of power in compact, giving you the flight time needed on your heavy-lift aerial photography rigs.

Conclusion for UAV battery packs

For fly a long flight times, choosing the right UAV battery pack is very important. Here I recommend using Tattu lipo which has gained most praise by FPV pilots. The following is Tattu Plus LiPo Battery Review by VidMuze who produces aerial cinematography, films, visual effects, tutorials and equipment reviews. You will make your choice after watching it.

 

Source: http://www.genstattu.com/blog/best-uav-battery-packs-for-multirotor-fly-long-flight-time/

Best 6s lipo battery for sale from Tattu and Gens ace

Maybe you are wandering in the remote control world, and you are familiar with all parts of your hobby models. But how to choose the best 6s lipo battery for your UAV/500 600 RC HELI/FPV/RC hobby drones etc.? Here allows me to introduce the best 10000mah 6s lipo battery for sale from Tattu and Gens ace, which are professional battery for RC hobby and drones.

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The range of 6s lipo discharge rate

Tattu and Gens ace 6s lipo battery packs have capacity from 15C battery to 75C battery, and more high C lipos will be produced. ALL of these high C lipos are beyond the bounds of multirotor, let FPV into the world of 3D flying, show high performance aircraft, and provide more power for you.

The range of 6s lipo capacity

Tattu and Gens ace 6s lipo battery packs have capacity from 1000mAh to 30000mAh, Stable automatic stacking technology endows single cell capacity of 30000mAh, higher than comparable size packs. High capacity, up to 30000mAh, will provide enough energy for your hobby models.

The wide applications of 6s lipo battery

Tattu and Gens ace 6s lipo battery packs are widely used in performance aircrafts such as RC heli 500 600 700 size (MIKADO LOGO500, ALIGN T-REX550/600, GAUI X5, Outrage 550, Hirobo SDX, etc), 180mm 250mm 280mm 310mm FPV Racing (Skylark M4-FPV250, INDY250 PLUS, Vortex, Emax Nighthawk 250, MOJO 280 etc) and big UAV drones such as DJI S800, S800EVO, Walkera QR X800, FreeFly CineStar 6, FreeFly CineStar 8, Freefly ALTA, etc.

Where to buy the best 6s lipo battery?

Here you come to the right place. Tattu and Gens ace 6s lipo battery for sale is via official online shop www.genstattu.com where has Local Service , Quality Assurance , Best Prices and Fastest Shipping. Free shipping over $49.99 in USA, Over $198 in Canada.

Source: http://www.genstattu.com/blog/best-6s-lipo-battery-for-sale-from-tattu-and-gens-ace/

Battery Unequal Voltages In Series Strings

In a small battery with just a few cells in series, the charger voltage is divided nearly equally among the cells. For example, when charging a standard lead-acid starter battery for a car, a constant voltage of 13.5V is applied to it, and each of the six cells within it sees about 2.25V. If any cell is charged more, its voltage will be a bit higher, taking away some voltage from the other cells. For example, if one cell is at 2.5V, the other celss will be, on the average, at 2.20V. That delta voltage among cells is perfectly acceptable; lead acid cells are much more rolerant to variances in their voltage.

For another example, a small Lipo battery for a consumer product may have two cells in series. When charging with 8.4V, if the cells are balanced, each cell sees 4.2V. If the cells are out of balance, in the worst case the most dicharged cell will be at 3.3V, leaving 4.9V on the most charged one. 4.9V is above the maximum rating for a Lipo cell (4.2V), but it is still low enough that is not going to go in the thermal runawy and catch fire.

In a high-voltage battery with many cells in series, though, there is a much greater chance that the overall pack voltage is not evenly divided among its cells. Here recommend a high security lipo battery for you.

High Security Gens Ace 7.4V 1300mAh LiPo Battery

7-4v-25c-lipo-battery

The security is the most important performance to a rechargeable battery. Without the security concern, battery will never be welcomed by people no matter how nice performance it has. Gens Ace 2s lipo battery 5000mah is the representative of li-polymer batteries. Along with the upgrading of rechargeable batteries, it is popular with more and more copter players. Li-polymer is charged with constant current and voltage. At the same time, it is equipped with a protecting circuit board to prevent the battery over charging or discharging. Besides, the outer of li-polymer batteries is with aluminum materials, which is different from the metal shell of liquid lithium electricity. Therefore, you can see the hidden trouble once the package is in deformation. Also, it will not explode but ballooning if there is any hidden problem.

Consider a 7.4v 2s lipo, charged up to 16.8V. If the cells are perfectly balanced, the total voltage will be equally divided into 4.2V per cell. In practice, the cells will be unbalanced, and one will be the first to be fully charged and then be overcharged. Lipo cells do not deal well with overcharging. Once charged, they cannot take more current as the other cells in series get their needed charge. Instead, their voltage rises rapidly, possibly to dangerous levels. In this example, the second cell is overcharged to 6.3V, while the other ones are around 3.5V. Despite the fact that the total voltage is 16.8V, three of the cells in this battery are not fully charged, and one of its cell is in danger of thermal runawy. Therefore, a system that relies on the total battery voltage to determine when to stop charging the battery gives the user a false sense of security; the system will overcharge some cells, and will create a safety issue as some cells with be overcharged to dangerous levels. It is therefore essential that a BMS monitor such a batter, first and foremost to prevent any cell from being overcharged, and optionally to balance the battery to maximize its performance.