Why Such a Short Time of RC Lipo Battery

The RC lipo battery has a limited life, like as human, cars. Under normal circumstances, RC lipo battery after about 200 times the charge and discharge of storage capacity to the discharge will be significantly decreased, use time is also lower. How to use the 200 times charge-discharge? Or how to extend the battery lifespan? Let's to listen the battery expert's recommend.

At first, charge the highest voltage of 4.20v

It's known to all, 4.20v is always the highest voltage of lipo battery, but with the development of technology and improvement. At present, most of manufacturers of lipo battery can be safe to reach 4.25v, even more of the top technology manufacturers can achieve 4.30v, so 4.30v is the highest voltage at current technology.

Model airplane with lipo battery charger are basic set voltage 4.20v, so use charger of voltage 4.20v to charge the lipo battery is OK, but if you raise the highest voltage to charge (such as 4.35v), they will irreversible damage the lipo battery.

At second, discharge the lowest voltage of 2.75v

Maybe many hobbyists have some questions, why? After research, every RC lipo battery has stage of voltage test from 4.20v to 2.75v. No matter from the battery internal structure theory of data, or from the battery discharge measurement, the lowest voltage is 2.75v.
Remind the important thing to hobbyists,at first tell you the roughly of the battery voltage contrast parameters:

2.75V approximately equal to 0%; 3.56V approximately equal to 5%; 3.70V approximately equal to 10%; 3.75V approximately equal to 20%; 3.85V approximately equal to 50%.
If not do scientific research and the battery with high resolution, the above data can be treated as a standard data. If there couldn't find the same leaves in the world, and also couldn't find two pieces of the same parameters of batteries, only the parameters of similar. So more than the contrast of voltage and power relations we only use symbols to represent "approximately equal to".

From the above battery voltage compare relations you can know, when the battery voltage to 3.56v is only 5% of the electricity, the 5% of the electricity control isn't good, it's easy to reach 0% of the limit value, more than the limit, the battery bilge gas immediately.

At third, within 1c charge current to the RC Lipo battery without injure. 5c charging isn't recommend

Battery charging is a process of converts electrical energy into chemical energy, is a chemical reaction. The chemical reaction has considerable relationship with temperature and pressure. The earliest lithium battery only lithium and manganese substances, the reaction procedure for Li+MnO2=LiMnO2 is REDOX reaction.

Why the cheap RC battery pack has the using lifespan?

According to the experimental data and theoretical prove, within 1c charge current to the battery without injure. More than 2c current will cause the capacity declined slight, and then up to the 5c current, the capacity obvious reduction.
The mainly reason of capacity reduction is the battery internal material generated crystal lead to chemicals. So we use the 1c current to charge is benefits the RC lipo battery.

Source: http://www.genstattu.com/blog/why-such-a-short-time-of-rc-lipo-battery/

Do you want to know more things about UAVs?

With the development of Dji and X-zero, we can buy a aerial device at the price of thousand dollars which sold at least ten thousand each one. But as more and more teams enter into the market, identical function and appearance can not satisfy consumers. So the price is the major element to attract consumers.

UAV control is a technology activity. It is easily influenced by environment. Although the UAV at the mid-high level is equipped with automatic return function it still does not apply to a complex environment because of their accuracy and reaction. Moreover it is too complex for shooting when you are control ling the aircraft.

In fact, there are many areas of UAV capabilities need to be explored. Follow us GREPOW(5000mah lipo battery) to predict the new features of the UAV in the feature according to the products and technology existed.

Four axises + fixed wing aircraft = Deformable structure?

It is reported by Geeks Park a deformable UAV designed by Tesla who comes from British. The biggest bright spot of the UAV is it can meet the requirements of different shooting through its deformation. There are two different flight postures of aircrafts. When they need stability it will shoot like a "helicopter". If you need high speed with the film it will fly immediately through becoming "tiltrotor aircraft".

Similarly, in an interviewing with Geeks park a domestic professional aerial equipment manufacturing company, the company's CEO also pointed out that the four-axis aircraft flight is with few flying postures, low speed and easily to be influenced by crosswind because of the monolithic construction. But the fixed wing aircraft could remain stable under high-speed flight. If the " Variable type " is introduced to UAVs the environment of them could be expanded with increasing speed and high safety.

However, because the operator can not view flight environment in time the safety of a flying UAV is not able to be improved from the consideration of structure or even may have crashed. If you want to avoid impact of the external accidents The UAV should designed with the function of avoiding obstacles by itself.

Avoiding obstacle and following with the film

Dji has released its next-generation UAV conceptual model called Phantom X it has the functions of following with the film, controlling an array of unmanned aerial vehicles with a mobile device. If you want the UAVs to fly following with the film or do a Array flight, there must be a certain autonomous founctions as obstacle avoidance and distance detection which also can be a judgement to define the UAVs.

“So many people in the production of unmanned aerial vehicles, but do not know how to prevent these things which can lead us to fall into trouble. " said doctoral Andrew, “Laser radar mounted on drones and establish the flight path in advance is unrealistic. If we want the UAV to fly at a high speed. We need better and faster need to algorith ms." Andrew Barry team let each UAV fly 10 meters and draw the next section of the route without considerating the flying of the following 10 meters.

New Exploration of aerial mode

In addition to aerial and follower function with the film, with the development of panoramic camera and VR technology, unmanned aerial vehicles in the shooting mode will have some breakthrough.

Geeks Park, at a venture exchange, was also experienced drones racing team combined VR and UAV. Compared to ordinary racing machine, vision provided by VR is more extensive. But if you fly it at high speed it will definitely affect the bit rate of the return video thus affecting the image quality at the receiving end. If you want to solve this problem a more stable and efficient wireless communication should be established with the input device. Currently, wireless transmission scheme used by the majority of drones. It supports data transfer of 4M bps, and can be effectively against harmonic interference. But the maximum bit rate can only support 720P and can not meet the public demand.

The biggest problem is to prolong the flying time

Through a series of products’ experience and the recent exposure of a variety of news the development of the future UAV is clearly. Overall UAVs are accelerating the pace of its development in structural, technical, aerial mode and so on. But it still has a critical problem to be solved – the flying time.
Currently lithium batteries are very popular in Civil UAVs, but the small volume of a single lithium-driven UAV flight the longest flying time is no longer than half an hour. And the time would be shorter if you want to ensure the difficult shooting not to mention the cutting-edge features such as panoramic camera and following automatically .

Two aspects we need to considerate when comes to the ability of UAV to keep flying. "power" and "Battery capacity" .To reduce power consumption, it is bound to make a considerable compromise on features, configurations. If you want UAV to be able to do more things the power consumption will be increasing. The four rotors of quadcopter and aerial itself are the major parts for power consumption so UAV battery capacity has to be increased but the overall size of which in turn will affect the UAV. We can say that the UAV can not be a breakthrough if there is no a term of battery matching them.

Source: http://www.genstattu.com/blog/do-you-want-to-know-more-things-about-uavs/

Intelligence of UAV lipo Batteries

In terms of a business perspective pattern , UAV lipo batteries intelligence , is a good direction and forms. Conversely , this form also makes a more profitable business model potential. Around us , the smart lithium battery is everywhere, notebook computers, mobile phones , and many mobile devices, have adopted smart lithium battery. UAV power lithium battery , it is the transition to smart lithium .

1.Solve over discharge problems spawned smart batteries

For non- disposable batteries, namely rechargeable batteries, over-discharge is the most annoying thing . Over-discharge means that the battery performance degradation. To avoid over- discharging the battery pack in the people has increased by over- discharge protection circuit , when the discharge voltage drops below a preset voltage, battery -powered stop outside . However, the actual situation is even more complicated , such as laptops , unmanned aerial vehicles , electric vehicles, because if you avoid battery discharge immediately stop power supply , then the computer will immediately shut down, too late to save a lot of data ; unmanned aerial vehicles, will direct fall from the sky ; electric vehicles will be anchored in without warning . Thus , the smart battery discharge battery protect themselves off just the last line of defense , before that , managing circuit also calculates the end of life, to provide early warning for the user , so the user has enough time to take appropriate safety measures .
Life time calculation and distance flown , the flight altitude , the current motor output power and other factors. These factors are dynamic, and the range of changes can be large , all the data needed to calculate in real time , which for the smart lithium battery management chip , algorithm design will make very high demands .

2.Solve charge and keep problems spawned smart batteries

Nowadays, lithium batteries have been very popular. As we all know , lithium battery charging , there are special requirements . The second is currently a large number of lithium batteries using a multi- core string and form , since the batteries of individual differences , resulting in the charge and discharge can not be 100% balanced , and therefore a perfect charge management circuit is particularly necessary. And this is the smart lithium battery to have the second function - to improve the lithium battery pack charge management , and discharge management .

3.Solve batteries power detection problems spawned smart batteries

Conventional battery voltage to be detected , the need for additional connection detection means , such as a voltmeter , etc. , and this can not be detected in real time during the flight . There is no more convenient and intuitive way to let users know in real time the remaining battery charge and other information we trust? Yeah , which requires battery management circuitry to complete.

4.Solve electrode contacts electrically rot aging problems spawned smart batteries

Maybe you have the impression that when the battery is connected to the moment drone on , plug sparks , accompanied by the sound of ignition . Over time, the reliability of the connection plug is lowered , and will lead to heat the plug , even the air melted. Plug problems caused by aging drone crash cases are not uncommon. To solve this problem , smart lithium battery management circuitry and also play a role .

5.Solve batteries copyright problems spawned smart batteries

Smart lipo batteries get a good copyright protection , on the one hand provide only original lithium battery, the battery can be better guaranteed quality , consistency better, and better reliability theory .

Above five points , the battery management circuit ( smart 14.8v lipo battery management module ) close contact with the original ecological battery together into a common forms of intelligent lithium battery . Smart lithium advantages are many, these " intelligent" to bring users the reliability , ease of use .

Notes of aircraft battery check

The problem of go aboard with batteries

1. How many batteries can bring with?

Combined with China's major airlines airport security requirements:

If battery energy is less than 100wh , you can carry two or more batteries without reporting; when 100wh <energy <160wh , you can take only two batteries, and need to delare to the airlines when check-in at the counter , to obtain a license voucher .

If Energy surpass 160wh ,you can’t take it to aircraft; such as: DJI S1000 + which using gens ace & tattu battery , even with the smallest adaptable capacity , 10000mAh battery ,it’s energy is 222wh, far higher than the upper limit of 160wh , can not take it to aircraft. So we recommend it’s better to mail to the destination at least five days in advance .

Please also notice:

The Lithium battery are using metal active material, high temperature spontaneous combustion or a short circuit spontaneous combustion and other accidents may occur during the flight. Therefore, lithium batteries must let go of power befor boarding. And make sure the battery was insulated in advance , Seal the battery positive and negative interface with an insulating rubber.

Remote control can not be checked, what to do?

When checking , the security staff pointed out aircraft remote control contains a lithium battery thus can not be checked, there are two ways:

1>Remove the battery out of the remote control;

2>Please call the big boss who is in charge of the checkpoint, try and explain that the battery of the remote control is a built-in battery and can not be removed,and you can ask him to carry out safety checks to the remote control.

How to count the excess baggage charges?

When the baggage weight exceeds the shipping weight stipulated by the airline (China flights, free shipping weight 20kg per person), you need to pay excess baggage charges.

Excess baggage fee calculation formula:

Excess baggage charge = [total shipping weight (kg) - the number of trips * 20 (kg)] *Adult full price ticket * 1.5%

How to solve the problem that batteries and other equipment can not travel with the team ?

1.Delivery in advance

If the battery energy surpass the transportation standard of the airlines, you can express to the destination in advance.
Be noticed that land transportation for UAV battery is slow(such as Beijing to Dali ,Yunnan the transportation time takes about 5 days), please send in advance and you’d better select a large and reliable courier company.

2.Courier company refuse to accept the battery.

After return from aerial location, it’s better to leave half a day to deal with the battery mail issue.
For small cities, Courier company companies may not do the battery business. In this case, you can try to complaints about the courier companies (note: Complaint to the head office, rather than the local branch), try to tell the staff there that the battery was mailed in accordance with the policy of courier company, Let they mail back the battery in accordance with company policy.
When the complaint reached the local branch from the head office,they will pay more attention to this issue. Even if the express outlets can not receive the battery, the customer service staff will recommend you go to a local heavy goods warehouse to mail battery.

3. The Sender’s information is very important

Before mailing, make sure the sender's address and contact telephone number are correct ,because once there’s problem occur during transportating,and can not pass through security, the battery will be returned to sender.
Mail back the battery from the aerial location is in the same situation. You need to find a local person to act as a Sender , once there’s problem occurs,the battery will return to the sender, no one will lost their 7.4v lipo battery.

4.Borrow or rent battery

You can also contact your local aerial shooting team, if they happen to have the same type aircraft battery, you can borrow or rent from them.
When travel with UAVs , we should have a sense of security , start from details, abide by relevant regulations of the local airport and airlines consciously .

Advises For the New Aircraft Hobbyists

With a growing popularity of RC aircrafts, there are more and more new aircraft hobbyists coming out paying little attention to the safety awareness. There are advises listed below, hoping these advises would do any help to those new hobbyists who are lack of safety awareness. Every hobbyist should have their safety awareness（rc car batteries lipo）.

1. Try to study more knowledge about the flying and to know how it works, the more you know about the flying theories, your flying skills would improve faster and you could fly your aircraft smarter. Huge differences between the hobbyists who have played for a while lie in how much they know about the flying theories.

2. Paying attention to the aircraft no matter when it is flying or landing, stay alert, get prepared for any emergency situations. Don’t even rest easy when you are landing your aircraft, passersby may get hurt by the propellers.

3.Getting more flights or practices makes you a better hobbyist. You may not improve your flying skills for one flight only, but accumulated flights will enrich your flight experience and your understanding for your aircraft.

4.Never overlook the suggestions brought up by the experienced hobbyists when you’re taking a flight. Listen carefully and treat seriously, it would avoid you from some dangers or severe outcomes.

5. Fly your aircraft slower and steadier when you stop the flight for a long time. Focus on every landing and taking off.

6. Check every single device on your aircraft more regularly to ensure a more safety flight. If you feel any abnormal happening on your aircraft, try to land it safely and check at once in case of a flight crash. Besides, more discussions or analyses after every failure flight is necessary to avoid getting your aircraft broken.

7.Always being in a good mood when you are flying your aircraft. Never argue with other hobbyists for any little trifles. You would enjoy a good flight when being happy. You may also fly at your best when you’re in a good body condition. Get a good rest and ready to stop flying your craft when you feel exhausted, depressed or in bad mood. Knowing to control your mood and keep a good body condition will also help for a nice flight.

8. Take the 14.8v lipo battery out of the aircraft when there is no need a flight in case the craft takes off by accident.

Four things you need to know to start FPV racing

FPV drone racing has become a very popular activitiy recently worldwide.There are many asks about FPV drone racing. Here I will write a article about some things you need to know to start FPV drone racing.

Start Transmitting Video&Video Camera

There are pretty much options for frequency choice but the most popular one for newbies is 5.8Ghz. It easy to get start an have fun without getting into trouble. 5.8Ghz has many nice channels to choose and you can buy a lot of different FPV related items for this frequency.Most FPV cameras available today are primarily from the video surveillance & security industry and work very as well for FPV due to the small size and good low light capabilities.If you are afraid of soldering or getting your wiring well connected then you can buy a all in one unit. These are video cameras with built in FPV transmitters .

Some famous FPV cameres:RunCam 2 Full HD Camera,SONY CMQ1993X HD Camera,etc

Select Your Video Transmitter

There are a lot of video transmitters available on the market today each with its own frequency,antennas and etc.
You should know not more power is better ,too much power can interfere not only with your gear but your friends signal too if you are flying in with friends. I suggest you start with with 25 to 200mW video transmitter.

And you should know FPV video transmitters are not your 2.4Ghz RC transmitter. They can’t frequency hop. You need to set the video transmitter to a channel and make sure the video receiver are in the same channel. If anyone else if flying FPV you have to make sure you aren't on their channel!

A good antennas is very important

Your FPV system is only as good as your antennas. Most start using what comes with most video transmittersand receivers.a simple omni directional linear polarized whip antenna set which, depending on your frequency, can give very poor performance.

Practice&fly safely

When flying a FPV drone, the pilot sees from the aircraft's perspective, and even not need to look at the FPV drone. So the FPV aircraft can fly well beyond visual range, it’s only limited by the range of the remote control and video transmitter.

Where is it safe to fly FPV? I would hope that most people would agree it’s dangerous that flying over largely populated areas, busy highways, and other areas of high population density,especially for beginners,you should choose a sparsely populated areas.Parking garages and forests are also perfect venue?for drone racing enthusiasts.So first make sure you get a proper FPV and good place to fly,then take someone with you who’s experieced with FPV racing.Do not attempt to fly 2 miles away from yourself, with headtracking, in high winds, near sunset, on your very first FPV flight! That is of course an exaggeration. However, FPV flying is entirely different than line-of-sight flying. You get a completely different perspective, and during your first flights, it is very easy to become disoriented. it takes practice, practice, practice.

Suggestions

I used voltage alarms on my planes and on my goggles. Losing power is not good and neither is ruining a 14.8v lipo battery.Tattu 1300mah 75c 4s ,this is maybe the most popular battery for FPV racing recently.

I suggest you to learn from someone who’s experienced with flying FPV. It will make you learn faster, easier and have more fun.
Fly safely!!This is the first principle!
Have fun!

You had better to know about the RC battery

More and more RC aircraft enthusiasts, but so many enthusiasts do not comprehend the rc car batteries lipo,which then they use the lipo battery is wrong,and even violation operation. That lead to battery swell,even fire. It is sound so terrible. Now I want to tell you some ways to use the battery. Of course,if you think this ways is wrong, welcome to criticism.

1.At the first time use the lipo battery, you should to charge first, and then use when fully charged. Do not use the partially charge,because it effect the battery life.
2. Charge to choose balance charger. Batteries charging with a few pieces, avoid monolithic battery voltage also other difference is too large, affect the service life of the whole.
3. Avoid the battery over discharge, it is recommended that the battery with low pressure alarm device, reasonable control the time of flight, for the plane leave enough spare capacity, To avoid no electricity caused the RC airplane bombed.A is the first killer of battery life!
4. Battery storage method, 3s 1300mah lipo to store the most appropriate voltage of 3.8 V or so, Do not be filled with storage, full of storage is the direct cause of the battery swells,Because the battery has the power, so the deposit after a period of time to conduct a charge and discharge process, voltage back to the store after store, doesn't charge for a long time. Self-discharge will cause low voltage, battery scrap directly.
5. After bombed, to check the battery have any injury or damage and monolithic voltage is stable or not, if the voltage is stable, normal skin without damage, you can use. But be careful, when charging had better pay more attention to observation, avoid the short circuit heating, even smoke explosion!After the bombing of the battery is not use.
6. Do not disassemble battery by yourself, Welding battery easy to cause overheating, don't match batteries welded together, it is easy to cause monolithic voltage use too fast, effect the battery life.
For the bulge of battery has already happened, Do not to frozen, pressure etc to let its recovery, batteries have taken place in the internal chemical reaction, not by external force can recover, more don't prick the battery with a needle, deflated after the battery is completely had zero voltage slowly in place. That is to say, the battery scrap completely.

5 tips to make your RC car go faster

One of the most popular topics in RC is speed.Experienced hobbyists prefer to point how two questions when they see an RC running: how fast and how much? we’re all a little obsessed with speed, and more specifically, going faster. Check out these five top ways for going for faster with your electric ride.

Higher Kv or Lower Turn Motor

This is the old fashion way to get more speed–add horsepower. Most brushless motors have Kv rating and the higher the Kv rating, the more rpm a motor will put out per volt. If the Kv rating isn’t listed, a turn rating will often be used. With brushed and brushless motors, a lower turn rating equals more rpm. Always check the limits of your speed control before installing a “hotter” motor. Increasing your motor’s Kv rating 2,200Kv can yield an increase of 20mph if your are using the same brand and model motor and have batteries that can supply the needed juice.

Higher Voltage Battery

To do this,get 3 or 6 rechargeable 9-volt batteries. Connect them in series pairs - gens ace 2s lipo batteries to make 18 volts, then two more in series, with this series connected in parallel to the first.for example, go from a 2S (2-cell) LiPo to a 3S 11.1v LiPo battery. This jump from 7.4 volts to 11.1 volts can increase speed by as much as 25mph! The more batteries you have in series, the faster it will go. The more you have in parallel, the longer it will run. By the way, make sure your speed control can handle the extra voltage or the only thing you’ll be fast is going to the hobby shop for a new speed control. You’ll also want to make sure your chassis can accommodate the the larger pack.

Aerodynamic Body

If you’re only going 25mph, aerodynamics aren’t going to play too noticeable of a role. If you’re going 50mph, aerodynamics will certainly start becoming influential on top speed. In addition to mounting a low profile, sleek body shell, mount it as low as possible and keep the wheel wells as small as possible. Open up the rear of the body to let trapped air to escape.

Better Grip Tires

All the extra power won’t do you much good if you can put the power to the ground and put it to use. Invest in some high-quality aftermarket tires in a soft compound and you’ll be going faster.

Yourself

Spend some time practicing the handling of your car out on the track. If you want your car to go faster, then you probably plan on racing it or you’ve been racing it. The winner of the race isn’t necessarily the person with the best car, but the person who has the best handling car and can best tackle the track. Find ways to get around the track easier and you’ll get faster lap times.

What ‘AMP’ RATE SHOULD USE FOR THE LIPO BATTERY

A LiPo Battery or more correctly lithium-ion polymer battery(abbreviated variously as LiPo, LIP, Li-poly and others), is a rechargeable battery of lithium-ion technology in a pouch format. It’s widely used in Radio controlled equipment ,Personal electronics,Electric vehicles,etc.

Just as with other kinds of lithium-ion cells, the voltage of a LiPo cell depends on its chemistry and varies from about 2.7-3.0 V (discharged) to about 4.20-4.35 V (fully charged), for cells based on lithium-metal-oxides (such as LiCoO2), and around 1.8-2.0 V (discharged) to 3.6-3.8 V (charged) for those based on lithium-iron-phosphate (LiFePO4).
The exact voltage ratings should be specified in product data sheets, with the understanding that the cells should be protected by an electronic circuit that won't allow them to overcharge nor over-discharge under use.
For LiPo battery packs with cells connected in series, a specialised charger may monitor the charge on a per-cell basis so that all cells are brought to the same state of charge (SOC).
If you’re not familar with LiPo batteries, or have just purchased a new charger, you maybe don’t know how to safely set up the charge rate for your battery. Though the battery supplier will show you what the maximum “Charge Rate” of the battery is. But this information is different from the “C-Rating” which is usually displayed as a number on the front of the pack (30C, 75C, etc).

If you are unsure of what your 7.4v lipo battery charge rate is , it would be safe to charge the battery pack at a 1C rate. To determine this number, take the mAh rating of your pack and divide it by 1000.
Here as belowing are some expamples:
Example 1: If your battery is 3300mAh your 1C charge rate is 3.3A. (3300/1000=3.3)
Example 2: If your battery is a 7000mAh pack, your 1C charge rate is 7A. (7000/1000=7)
Example 3: If your battery is a 250mAh pack, your 1C rate would be 0.3. (250/1000=0.25 it’s okay to round up)
And if your battery allow for a higher charge rate (Usually the general range is 1C-5C) simply take the numbers you came to calculating your 1C rate and multiply it by that factor. We can use the above 3 examples.
Example 1:
The first example was a 3300mAh battery pack, which gives us a 3.3A charge rate at 1C. And a 2C charge rate form a 6.6A, a 3C charge rate would be 9.9A and a 5C charge rate would be 16.5A.
Example 2:
7000mAh 1C charge rate = 7A
2C charge rate= 14A
3C charge rate= 21A
5C charge rate= 35A
Now you should be confident when you need to decide the “AMP” rate when charging your 2s lipo battery 5000mah. Always double check that your voltage is same with the one listed on your battery label.