Knowing the lithium battery safety knowledge can save your life at a critical time

Jonathan Strobel, a resident of Palm Beach County, Florida, alleges in the suit that his Note7 was in his right pocket on Sept. 9 when it exploded, causing "severe burns" to his leg, leaving him "in shock and extreme pain due to his injuries". Nearly a million Note7 smartphones were sold in the United States. The recall applies only to Samsung Galaxy Note7 phones sold before Sept. 15, 2016. Samsung has received 92 reports of the batteries overheating in the U.S, including 26 reports of burns and 55 reports of property damage, including fires in cars and a garage. Three Australian airlines have banned passengers from using or charging Samsung Electronics' Galaxy Note 7 smartphones during flights due to concerns over the phone's fire-prone batteries.

 Samsung Note7 mobile phone batteries like most cell phone batteries are lithium batteries, lithium batteries are more and more widely used in our daily-life, such as our unmanned aerial vehicle batteries are lithium batteries, so learning how to use and maintenance the unmanned lithium batteries is very important.

Why did the lithium battery explosion?

Lithium battery are better than lead-acid batteries, nickel-cadmium batteries, nickel hydride batteries in performance, and it is better than fuel cells in discharge times. But the safety of lithium batteries still needs to be improved. The biggest hazard of lithium batteries are lithium cobalt oxide lithium batteries in case of overcharge lithium anode formed in Dendrite and pierces the diaphragm, forming internal short circuit. External short circuits, internal short circuit will yield hundreds of amperes of current, resulting in a battery explosion is overheated.

How to use lithium batteries?

1.The charge voltage should not exceed specified limited voltage (each battery chip is 4.2 volts), 4.25 volts is the highest limitation of each charge voltage. Charge current should not be too large (like the TATTU brand charger of 1500mAh 3s battery should be set at 1.5 amperes to 2.5 amperes to charge)
2.Connect battery positive and negative electrodes correctly. If the anode and cathode of battery swap the cell's poles over will not accept a charge. Reverse charge will make battery damage, cause heating, explosion, leaking and burn.
3.Over discharge will make battery damage. When the battery discharges, monomer battery voltage should not be less than 3.6 volts (When single cell is 3.8 volts, the plane should almost begin to descend.)
4.The battery should be kept in a cool environment. When storing the battery for a long time (over 3 weeks), suggested to put in the environment that temperature keeps at 10 to 25 degree Celsius, low temperature and non-corrosive gas. Battery needs to charge and discharge once three months to keep battery activity, and ensure every chip voltage in the range of 3.7 to 3.9 volts.
5.A good battery should have a good charger. Don't use no-name charger.

6.FPV must choose the branded batteries, don't use unknow batteries. Single cell voltage has big difference.

The safety of lithium batteries is not a peripheral issue, it is based on the material nature of technology issues. Battery factory safety testing must also be stricter. The source of Samsung Note 7 battery issue hould be battery manufacturing issues. For most drone lovers, how to Choose a drone battery? You should choose a trusted brand, such as Tattu drone battery, Tattu battery is more focused on Drones/Multirotors/UAV battery pack and designed with high energy density and high discharge rate cells. It has highly reputation in the market with its stable performance. Tattu is committed to supply the safe, stable as well as long cycle life battery for UAV. With each team member takes advantage of individual superiority and take part in the more discussion, we can always keep continuous progress. Except for the universal products, we also devoted ourselves to customize as per your need. Now more and more drone lovers choose Tattu for their FPV batteries, UAV batteries and RC car batteries, because tattu batteries are very useful, safe.
Source: http://www.genstattu.com/blog/knowing-the-lithium-battery-safety-knowledge-can-save-your-life-at-a-critical-time/

The use and maintenance of the FPV battery

Now FPV all use Lipo battery, and there are many pilots that they all used 3s/4s battery in the FPV racing competition.
The so-called 3s is composed of three layers lithium cells in series that shows each cell voltage is 3.7 volts, each lithium chip actual voltage is in the range of 2.75 to 4.2 volts. The capacitance marked on lithium is that the energy was getting when 4.2 volts discharge to 2.7 volts. The FPV lithium voltage must be kept at the range of 2.75 volts to 4.2 volts for use. If the battery voltage is lower than 2.75 volts, it is excessive discharge, lithium battery will expand and the chemical liquid will crystallize. The crystallization may pierce the internal structure that cause battery short circuit, even changes voltage charge into zero. The remote model airplane voltage is higher than 4.2 volts, it is overdischarge, the internal chemical reaction is too excessive and the lithium will expand, if voltage keeps charging, the RC lipo battery will expand and burn.

No matter overdischarge or overcharge, both can cause a lot of damages to remote control model airplane battery.
Because FPV battery almost use for violent flight, so must pay attention to the skills about the use and maintenance of FPV battery.
1.The charge voltage should not exceed specified limited voltage (each battery chip is 4.2 volts), 4.25 volts is the highest limitation of each charge voltage. Charge current should not be too large (like the TATTU brand charger of 1500mAh 3s battery should be set at 1.5 amperes to 2.5 amperes to charge)
2.Connect battery positive and negative electrodes correctly. If the anode and cathode of battery swap the cell's poles over will not accept a charge. Reverse charge will make battery damage, cause heating, explosion, leaking and burn.
3.Overdischarge will make battery damage. When the battery discharges, monomer battery voltage should not be less than 3.6 volts (When single cell is 3.8 volts, the plane should almost begin to descend.)
4.The battery should be kept at a cool environment. When store the battery for a long time (over 3 weeks), suggest to put in the environment that temperature keeps at 10 to 25 degree Celsius, low temperature and non-corrosive gas. Battery needs to charge and discharge once three months to keep battery activity, and ensure every chip voltage in the range of 3.7 to 3.9 volts.
5.A good battery should have a good charger. Don't use no-name charger.
6.FPV must choose the brand batteries, don't use no-brand-name batteries. Single cell voltage has big difference.
7.When fly in the hot weather, try to choose the moments that before sunrise or after sunset that the temperature is not that high. Pay attention to the heat dissipation of the battery and the electronic speed controller. If can hang the batteries and electronic speed controller outside of the plane, try to dissipate heat outside.
Source: http://www.genstattu.com/blog/the-use-and-maintenance-of-the-fpv-battery/

How can we lack lipo car battery for carnival in the tracks

It is lucky for most of RC car fans to see various modified vehicles and shows performed by masters of drifting with roaring motors and drifting smoke. Many people think that RC cars are toys, which is absolutely not. RC is the abbreviation of remote control, and RC cars follow the strict restrictions regardless of body size or control effect and have high degree of simulation, which is far from what RC toys can do.

Carnivals in the tracks due to the best RC battery

There are several conventional ratios between RC cars and physical cars, such as 1:10, 1:8 and 1:5. RC cars can be classified into drift cars, racing cars, rally cars, off-road vehicles, desert trucks and monsters etc. They have the dynamical system and suspension system the same with cars, which can complete the acceleration from 0 to 100KM and reach 140KM easily.
Of course, whether drifting or acceleration, instantaneous burst moment must be awesome, or cool view can't be shown. When it comes to this, we have to mention the power source of the RC cars - lipo carbattery. On the market, high capacity, high rate, powerful battery will be more favored by RC fans, which is because speed is the focus of the competition, so an awesome battery is needed for carnival in the tracks.

 

Let's take a better lipo car battery for you:

Gens ace 5000mAh 7.4V 50C 2S1P Hardcase Lipo Battery Pack 10# with 4.0mm banana to Deans plug

Brand: Gens ace
Capacity: 5000mAh
Voltage: 7.4V
Discharge Rate: 50C
Max Burst discharge Rate: 100C
Configuration: 2S1P
Connector type: 4.0mm bullet Deans
Balancer Connector Type: JST-XHR
This is a Gens Ace 2S 50C 7.4V 5000mAh LiPo Battery Hardcase Pack, with a factory installed Deans connector. Consumers trust the Gens Ace name to deliver the dependability and high performance they expect. The Gens Ace 50C 2S 5000mAh 7.4V LiPo battery pack has a high-capacity, high-discharge rate that gives you the power and run-time you expect from all Gens ace lipo batteries. This battery is ideal for all 1/10 scales & 1/8 RC car, etc.

Thoroughly tested and rated at a continuous 50C, the all-new Gens Ace 5000mah lipo battery Hard Pack is perfect for the rigors of on and off road racing. It features improved internal materials, heavy gauge silicon wires, burst of 100C and applies to almost all 1/10 racing with a fast charging of 5C.

Features:

1. Stable automatic stacking technology enables single cell capacities of 5000mAh.
2. The most strict single cell capacity, voltage, resistance, discharge curve matching process.
3. Superior Japan and Korea Lithium Polymer raw materials.

Application:

Equipped with industry-standard 4.0mm banana+XHR-3P plug, compatible with LiPo balance chargers for 1/8 & 1/10 RC car model
It is difficult to operate a RC car. Short-term practice can not achieve the desired effect at all. After a period of practice, the feel from perfect drifting is not worse than that from a car, that is the charm of the RC car. Wish you have a good time.


Source: http://www.genstattu.com/ga-b-100c-5800-2s1p-hardcase-10.html

How to evaluate the quality of RC lipo battery?

It is so dazzling that there are numerous types of RC lipo battery on the market today. However, the quality of lithium polymer battery is a major worry for aeromodeller, and therefore, we today make popular scientific education about how to evaluate the quality of lithium polymer battery.

Most of current lithium polymer batteries and all the UAV batteries are the battery pack with composition of the connection in series and in parallel, including connection in series presenting as "S" and connection in parallel presenting as "P". For example, 3S battery means 3 chips connected in series, and 6S2P means 12 chips of battery core with 6 chips connected in series and 2 chips connected in parallel.

Why it does need to be connected in series or in parallel?

It is determined by the lithium polymer battery. It is connected in series for increasing voltage, while as connected in parallel for increasing capacity. The C rate of battery will never change with the connection in series or in parallel. The battery with high C rate is used in the low-power equipment, such as remote control and receiving of image transmission, which has no effect on the equipment as long as the voltage does not exceed to damage the equipment.

How to evaluate the quality of single-chip battery core and battery packs?

Performance valuation of single-chip battery core

1.Target rate of C: is the discharge rate can reach the identified rate value of the battery

In accordance with the industry standard, the C rate of a battery is evaluated by discharging with X rate of battery capacity, and the battery discharge is not lower than 3.50V and the discharge curve is smooth around 3.50V. The C rate of the battery is the maximum value of X, which is evaluated by various indicators, including pressure drop, holding capacity of pole piece, temperature, flatulence or not, safety, etc.

2.Target rate of capacity: The capacity can reach the identified capacity value of the battery

In general, high-quality battery core shall be designed with 3%-5% higher than the design capacity, which is used in the high-quality battery chip of China's major plants, with a single capacity around 5200MAH.

3.Cycling life

There is no standard outlining how long is the cycling life of lithium polymer battery in the current industry, due to the cycling life has a close link with battery production process. Through analyzing the current test data, it indicates that the capacity of the battery is decreased in various degrees by each process of charging and discharging.

Performance valuation of lithium polymer battery packs

High-quality single battery core may not produce a high-quality lithium polymer battery pack, but high-quality polymer battery pack must be composed of high-quality battery cores, which is related to the matching problems. Matching is a very complicated technique with high requirements for the equipment, which requires a battery pack composed of battery cores consistent with all capacity, the C rate and attenuation rate. Life of the battery pack is shortened by a large difference in any one of the three indicators, while as the similar values of the three indicators indicate improved performance of the battery pack to ensure flight safety.

To give an illustration

For example, 30C 3S 5000mAh lipo battery. The battery match with the capacity of three batteries are 5120MAH, 5120MAH and 5320MAH respectively, and all three batteries are charged to 4.20 V. After discharging 5000MAH on the model airplane, the remaining capacity of the three batteries are 120MAH, 120MAH and 320MAH respectively, which causes voltage unbalance in the battery pack by high voltage in the 320MAH battery and low voltage in the other two batteries, as certain relationship between capacity and voltage. In the case of discharging to 5150MAH, two batteries may actually change into reverse charging situation, and it may be wrongly assumed that the battery pack still has power as one battery has voltage, which will definitely affect the life of the battery pack.

This is caused only by the unbalance in the capacity. If there is a large difference in the C rate, it may cause unbalance during the charging process and ultimately affects the battery pack's life, even with the same capacity, which is for the reason that the more discharging rate with a high C rate, and the less power consumption.


Therefore, it is a simple way to evaluate a battery is whether a high-quality lithium polymer battery or not.
Method:
Step 1: full of electricity, and make sure every single battery in the same pack with the voltage of 4.20V;
Step 2: install the battery pack on a aircraft and wait for each single battery's voltage around 3.66 V;
Step 3: separate testing the voltage difference on each single battery, and the qualified high-quality battery has the voltage difference in 0.01V.

In addition, single measuring voltage of the high accuracy digital multimeter shall be prevail, and it is better to measure by a digital mutimeter in thousands.

Benefit to play RC cars

Many do not realize the excitement that comes from playing with Remote control cars, in fact, many actually perceive them as kids' toy, and for some reason they are. But the moment you ask your kid for that remote control whether you are thirty or ninety, and as long as you enjoy tinkering with things, and you are a car enthusiast; you will love the enjoyment that comes from playing with Rc cars. It's probably because during our childhood we never had an opportunity for such fun like today's kids.
Anyway, what are the benefits that come from playing with RC cars?

It's just fun

The primary reason why you need to play with these cars is that they are fun. There is nothing so satisfying as watching this small, powerful car tear through the backyard with 60 Mph, and quickly blazing across your pavement as you steers it and control the speed as you like. Although you kids will need supervision when playing with RC cars, the play is largely independent, so your kid will learn to form opinions and draw conclusions about their surroundings, which can help improve school grades.

Competition

Many people find their competition through online games, but the RC car gives a chance to compete in a much healthier way, not to mention in an exhilarating fashion. A kid who loves RC will want to compete with a family member, and would want to race their car much better than the family opponent. This is actually the most alluring aspect of RC cars; a chance to connect with other members of the family, outdoors not indoor.

Socializing

Play with RC cars will definitely make your kids new friends. You will most likely come across communities with RC clubs or gatherings on weekends, and Rc cars is a fun way for your kid to make new friends and develop social skills. RC cars have actually evolved to the point that they are now considered as small cars, so you will also come across elder clubs with these cars on their social gathering, so playing with these cars is a great way of making new friends even to the old.

Enhancing an interest

The moment your kid plays an RC car, they are slowly developing and enhancing another interest. Maybe they will want to be a car racing driver in future or maybe an engineer. As you might have realized RC cars uses the same fundamental principle as the one on the regular car. Some schools are actually using RC cars as a learning aid.

Hand to eye coordination

Just like video games, remote control vehicles can help a player increase hand eye coordination, but in a better way the video games, this is particularly because they use real word navigation. Also, the crashing and car damage are real, so playing with RC can actually hone reaction time when driving the real cars.

There are excellent selections of RC cars online, ranging from simple design to advances, used to new. Don't forget to get a powerful battery because with mediocre brands; there is no fun with RC cars. Try RC Gens Ace RC car lipo battery car, from the top rank company with extensive experience in battery manufacturing. Their 7.4V 5000mAh lipo battery has a high capacity, high discharge rate to give you the power and the runtime you need on your RC car.
source: http://www.genstattu.com/blog/benefit-to-play-rc-cars/

How to experience the fun of flying FPV for beginners

The FPV just like the F1 racing car in the drone, which uses the first person view to control. In the process of flight, through the specified arches, high-speed turns sideways, all-around flips to control the flight. Then, when beginners to play FPV, how to fly it and what to attention?

1. Flight Security

The FPV hitting obstacles is inevitable with a high-speed flight in the air. So most of FPV have a anti-fall. But we should to pay more attention to the flight safety, avoiding to hurts somebody.

2. Choose Open Place

For the FPV racing, it just like the F1 racing car, there is a corresponding runway. For beginners, the FPV is suitable for flying in an open environment. Indoor or small-scale place is dangerous. And don' choose place that have many trees,people or other obstacles.

You can search for open site on the website to practice. When your skill have high level, you can set arch to practice operations, and also to plan the special flight routes to increase the difficulty..

3. FPV Battery

The battery is also the key to experience the fun of flying FPV. At present, most of FPV battery flight time is about 10 to 20 minutes. So in order to flight more long time you can prepare more FPV batteries or choose the best lipo battery brand .

For the battery, I recommend the Tattu FPV batteries, they have a strong burst, high capacity and long flight time. At present, a lot of FPV drone pilots are using their batteries,such as 1300mAh lipo,1050mah lipo and 1800mah lipo battery, and they made outstanding achievements. So, the Tattu battery is worth to recommend and trust.

4. FPV image transmission

For beginners, it is very necessary to have a FPV image transmission display device. It is very helpful to determine the flight path, especially the direction control. Visual flight is a kind of training method for masters. So, the video display device is necessary, and the best choice to have high definition VR glasses.

5. An assembly or a set

In the FPV drone, the aircraft wheel base is usually used to distinguish the FPV. In addition to the difference in size, the flexibility, speed control, battery capacity and other aspects are different. When the size of wheelbase is large, the load bearing can also be increased, and the battery ,the beginners, the balanced 250 series which has the stable GPS is more suitable, and it is easier to control, so as not to burst.
FPV is a very interesting type of aerial UAV. With goggle glasses, Have a fun of flying FPV.
Source: http://www.genstattu.com/blog/how-to-experience-the-fun-of-flying-fpv/