Tag Archives: 7.4v lipo battery

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 lipo car battery, 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/

Review of Gens ace 5000mAh LiPo battery

Your electric RC car can have the most powerful brushless motor on the market and be geared to hit 90mph, but without the right battery nothing else even matters. When my beloved Gens Ace lipo battery pack started to show signs of wear, I knew it was time to purchase a new one, so I went with this lipo pack from genstattu.com.
This 7.4v 5000mah Lipo battery used air bag lining to pack,it came in a hard box that protect the battery more sufficiently during shipment.Of course,very pleased with the shipping.They dispatched via UPS from USA directly,so fast.
Trust the battery that consistently delivers the dependability and high performance, the Gens ace 50c 2s 5000mah lipo battery has a high-capacity, high-discharge rate that gives you the power and run-time you expect from all Gens ace lipo batteries.
Gens Ace 2S 50C 5000mAh Hardcase LiPo Battery Pack, with a factory installed Deans connector, and it is ideal for all 1/10 scales & 1/8 RC car, etc.

Specifications

company:Gens ace
Capacity: 5000mAh
Configuration: 2S1P
Dimensions 138 x 47 x 24 mm
Net Weight: 294 grams
Short exposure time max. 500A (100C)
Load duration max. 250A (50C)
Resistance (milliohms): <20mohm
Connector Type: 4.0mm bullet to Deans
Balancer Connector Type: JST XHR

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
Thoroughly tested and rated at a continuous 50C, the all-new Gens Ace 5000mah 50C LiPo 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.

High burst

I attend competitive racing occasionally, this is a pretty nice battery for the high burst rate, faster and stronger. And also I running on the loose dirt and indoor clay,it has better performing,long lasting battery. I recommend to anyone who wants to reliable battery.

Conclusion

I like this Gens ace battery,it gives me fun, and the Gens ace lipo battery is more and more drivers to widely used . Anyone who wants to have a high-discharge rate battery pack , without hesitation. In other words, whether you need to choose Gens ace lipo battery or not depends on yourself. And finally,wish you have fun.

Source: http://www.genstattu.com/blog/review-of-gens-ace-5000mah-lipo-battery/

Proper Care for Discharging Lipo Battery

LiPo batteries offer plenty of power and runtime for us radio control enthusiasts. But that power and runtime comes at a price. LiPo batteries are capable of catching fire if not used properly – they are much more delicate than the older NiMH/NiCd batteries. The problem comes from the chemistry of the battery itself.

gens ace battery

RC LiPo battery packs offer high discharge rates and a high energy storage/weight ratio. However, they are not without their downsides. Mishandling of these batteries can lead to fire, explosions and toxic smoke inhalation. Radio control LiPo battery packs require unique and proper care if they are going to last for any length of time more so than any other battery technolog.

LiPo batteries are completely different when it comes to discharging and storage. Depending on the output voltage of your pack, you should only discharge your pack so far. For example, during use, a 7.4V LiPo battery (also known as a “2 series” or “2S” pack) should never be discharged below 6.0 volts under load (3.0v per cell). For storage of 2 weeks or more, LiPo packs should be stored at approximately 3.8v per cell to prevent overdischarge or imbalance from developing among series cells in the packs due to differing levels of each cell’s self-discharge rate. In the case of a lipo battery 3s pack, the pack should always be stored at 7.6v. You should also store your LiPo batteries in a fireproof container or cabinet and never store your LiPo, or any other battery for that matter, in the model itself.

Lithium-Polymer batteries contain, quite obviously, lithium. Lithium is an alkali metal, meaning it reacts with water and combusts. Lithium also combusts when reacting with oxygen, but only when heated. The process of using the battery, in the sometimes extreme ways that we do in the R/C world, causes there to be excess atoms of Oxygen and excess atoms of Lithium on either end (be it the cathode or anode) of the battery. This can and does cause Lithium Oxide (Li2O) to build up on the anode or cathode. Lithium Oxide is basically corrosion, albeit of the lithium kind; not iron oxide, which is otherwise known as “rust”. The Li2O causes the internal resistance of the battery to increase. Internal resistance is best described as the measure of opposition that a circuit presents to the passage of current. The practical result of higher internal resistance is that the battery will heat up more during use.

Never over discharge your RC LiPo battery pack.

You should never discharge a RC LiPo battery pack down past 80% of its capacity to be safe. For example, if you have a 2000mAh radio control LiPo pack, never draw more than 1600mAh out of the pack. If you go past 80% of its capacity, this will cause the pack to heat up and shorten its lifespan considerably.

Charging/Discharging: Your new pack arrives half charged. Charge your pack fully before first use. Charge your LiPo battery pack at 5C or less on the LiPo setting only. You must use a balance charging system similar to the Hyperion chargers offered here at MaxAmps. Otherwise, you risk your pack becoming severely out of balance over time, which will significantly decrease the lifespan.

Ex: If charging a 4000mah 2200mah 3s lipo battery pack at 1C, you would be charging it at 4 Amps.
Ex: If balance charging a 4000mah LiPo pack at 5C, you would be charging it at 20 Amps.

At 7.4 v, 1000mah 20c Lipo, hypothetically, you can safely discharge at 20amps. Working the math, your 12v 55w car headlight will suck an average of roughly 6.8amps,…so you’re well within the safe limits.

As we touched on earlier, some modern chargers (like the Hitec X1 Touch I mentioned) can read the internal resistance of the battery in milliohms (mΩ). If you have one of these chargers, you can get a sense of how your LiPos are performing, and how their internal resistance increases as they age. Simply keep track of the internal resistance reading each time you charge your battery, and chart the increase over time. You will see how just the process of using the LiPo battery begins to wear it out.

A LiPo cell should NEVER be discharged below 3.0V

The LVC works to cut-off the motor of the vehicle (or in some cases, pulse the motor) to alert you to a nearly-depleted battery pack. It uses the total voltage of the battery as its reference. Most LVCs cut-off around 3.2V per cell. For our two-cell example battery, that would be 6.4V. But if our battery isn’t balanced, it’s possible for the total voltage to be above the cutoff threshold, yet still have a cell below the 3.0V danger zone. One cell could be 3.9V, while the other could be a 2.8V. That’s a total of 6.7V, which means the cut-off would not engage. The vehicle would continue to operate, allowing you to further degrade the battery. That’s why balancing is so important.

So when running your LiPo, make sure you have the Low Voltage Cutoff enabled, set up correctly, and for the sake of all that is Holy, don’t continue to run it after the LVC has kicked in! It may be a slight nuisance, but it’s worth enduring so that your LiPo batteries remain in good health.

It’s worth noting that most helicopter speed controls and some airplane speed controls do not have a Low Voltage Cutoff, as disabling the motor in mid-air wouldn’t be a good idea. For these kinds of applications, it’s best to set a conservative timer (some aircraft radio systems have a timer function built in) and land when the timer goes off. Whether your R/C vehicle has a LVC or not, it’s not a good idea to fly until the battery dies!

The Experience about Parallel Charging My LiPo Batteries

What is parallel charging?

In a nutshell parallel charging allows for multiple same cell count batteries to be connected in parallel to create a single larger logical battery that can then be charged. The following is my experience about lipo battery parallel charging.

With cells in series, and no balance lead, your charger has no idea how much voltage is in an individual cell; it only knows the total voltage. If it reads 7.4V, that might be cell 1 with 4.2V and cell 2 with 3.2V, or it might be cell 1 with 3.7V and cell 2 with 3.7V, or it might be something else. Unless the charger connects to the balance lead, it just doesn’t know. So, let’s imagine it’s the first case. You start charging, with cell 1 at 4.2V and cell 2 at 3.2V, and the charger says, “ok, I need to see 8.4V before I stop, so I’ve got a long ways to go,” when in actuality it is going to overcharge cell 1 and possibly blow it up or catch it on fire, and definitely it is going to ruin or at least damage cell 1 at a bare minimum. That’s where active balancing comes in. Cells in series must be *actively* balance by a smart charger, to get them to be equal.

gens ace lipoHowever, here’s what you’re missing still: cells in parallel do *not* need active balancing by a smart charger. Rather, they naturally, by the laws of physics, will perform passive balancing. Cells in parallel automatically, passively, due to voltage gradients (differences), self-balance until they are equal. If you take 2 individual LiPo cells, and place them in parallel, and wait long enough, no matter what voltages they *were*, they will equalize, automatically, to become *equal* voltages over time. One will discharge into the other, until they are equal.

So, in your case of 11.1v 2200mah lipo, when you place the whole packs in parallel, and the balance leads in parallel too, cell 1 of pack 1 is placed in parallel with cell 1 of pack 2, so both cell 1′s will automatically, by the laws of physics, passively balance until they are equal. Both cell 2′s will also passively balance until they are equal, since cell 2 of pack 1 is also in parallel with cell 2 of pack 2. However, both cell 1s (as if a large single cell) are still in series with both cell 2s (as if a large single cell), so *active* balancing is still required here, to get the cells in *series* actively balanced, and that’s where the smart charger does its job.

Therefore, when charging in parallel, you are still getting all 4 cells to be balanced, just as if you were not charging in parallel.

What are some specific uses of parallel charging?

450 sized heli:
Many times people start with a 450 sized heli and in the beginning they can not get enough flight time. This is what we call the “Welcome to your new addiction” stage. Parallel charging can be a great aid to the new pilot. For example with a 350W charger a 6x parallel lead set, a new pilot could charge 6 450 packs in 30min.

700 sized heli:
Larger electric helis are becoming very popular and they come with large needs in terms of power. A common battery pack for a 700 is a 12s 5000mAh made up of (2) 11.1 v 3s lipo battery wired in series. Due to the lack of 12s chargers available, a need for charging pairs of large 6s packs has arisen. Of course you could use 2 chargers, or a dual port charger, but there is another solution, a solution that really brings out the best on the new powerful chargers offering 1000W or more of output. By using one of these new 1000W chargers and parallel charging, you can charge a pair of 6s 5000mAh packs in 25min or less.

Remember to be careful about large voltage gradients (differences), however, as the passive balancing can be quite fierce (and potentially damaging or even dangerous), if cell voltage differences are too great before being placed in parallel–refer back to my article for warnings & recommendations on this.