What is Lipo battery? When I first time to hear this name, I didn’t know what’s that? I can’t find its difference between other batteries. And later I search it from Google, and I have looked up the Lipo battery information, I have knew more about it. The “Li-po” full name is Lithium Polymer batteries, they are a newer type of battery and used in radio control industries, like drones, UAVs, rc car, rc helicopter and some other RCs. They have been more and more popular over the last few years, and they can offer enough power to RC hobbies.
As we know, in the past, we also used NiMH batteries and Nickel-Cadmium batteries, but why does Lipo battery get more and more popular? I think we should know about the difference between Lipo batteries and NiMH batteries.
Lipo batteries advantages:
- Lighter weight
- Higher capacities
- Higher discharge
Not only these, Lipo battery can be made in almost any size or shape, and higher capacity can hold more power, your drones can fly longer, higher discharge can power your drone higher speed, it is very important for FPV racing or rc car racing.
Lido battery drawbacks
- Shorter lifespan
- Hard to care
Though Lipo battery have many advantages to NiMH batteries, but their lifespan is shorter than NiMH, and they are not safe, the sensitive chemistry of the batteries can lead to fire if the battery gets punctured and vents into the air. LiPo batteries need special care in the way they are charged, discharged, and stored. The required equipment can be expensive.
What are these numbers of Lipo batteries means?
When we get one Lipo batteries or search the Lipo batteries on the GensTattu.com, we can see there are some numbers on the Lipo batteries, for example, there is one Lipo battery from gesntattu.com, and we can see there are some numbers on this battery, and next let’s talk about these numbers mean. This is a Tattu 1300mAh 4S 75C Lipo battery.
The 1300mAh is the capacity of this Lipo battery, 4S is the battery’s voltage, 75C means the discharge rate.
A LiPo cell has a nominal voltage of 3.7V, and a lipo cell = 1 cell = 1S = 3.7V. For the 14.8V battery above, that means that there are four cells in series (which means the voltage gets added together). This is sometimes why you will hear people talk about a “4S” battery pack – it means that there are 4 cells in Series. So a four-cell (4S) pack is 14.8V, a three-cell (3S) pack is 11.1V, and so on.
The voltage of a Lipo battery pack is essentially going to determine how fast your vehicle is going to go. Voltage directly influences the RPM of the electric motor (brushless motors are rated by kV, which means ‘RPM per Volt’). So if you have a brushless motor with a rating of 3,500kV, that motor will spin 3,500 RPM for every volt you apply to it. On a 2S LiPo battery, that motor will spin around 25,900 RPM. On a 3S, it will spin a whopping 38,850 RPM. So the more voltage you have, the faster you’re going to go.
The capacity of a battery is basically a measure of how much power the battery can hold. Think of it as the size of your fuel tank. The unit of measure here is milliamp hours (mAh). This is saying how much drain can be put on the battery to discharge it in one hour. Since we usually discuss the drain of a motor system in amps (A), here is the conversion:
1000mAh = 1 Amp Hour (1Ah)
I said that the capacity of the battery is like the fuel tank – which means the capacity determines how long you can run before you have to recharge. The higher the number, the longer the run time. Airplanes and helicopters don’t really have a standard capacity, because they come in many different sizes, but for R/C cars and trucks, the average is 5000mAh – that is our most popular battery here in the store. But there are companies that make batteries with larger capacities. GensAce & Tattu even has one that is over 22000mAh! That’s huge, but there is a downside to large capacities as well. The bigger the capacity, the bigger the physical size and weight of the battery. Another consideration is heat build up in the motor and speed control over such a long run. Unless periodically checked, you can easily burn up a motor if it isn’t given enough time to cool down, and most people don’t stop during a run to check their motor temps. Keep that in mind when picking up a battery with a large capacity.
Discharge Rating (“C” Rating)
The C Rating is simply a measure of how fast the battery can be discharged safely and without harming the battery. One of the things that makes it complicated is that it’s not a stand-alone number; it requires you to also know the capacity of the battery to ultimately figure out the safe amp draw (the “C” in C Rating actually stands for Capacity). Once you know the capacity, it’s pretty much a plug-and-play math problem. Using the above battery, here’s the way you find out the maximum safe continuous amp draw:
75C = 75 x Capacity (in Amps)
Calculating the C-Rating of our example battery: 75 x 1.3 = 97.5A
The resulting number is the maximum sustained load you can safely put on the battery. Going higher than that will result in, at best, the degradation of the battery at a faster than normal pace. At worst, it could burst into flames. So our example battery can handle a maximum continuous load of 97.5A.
How to care Lipo batteries?
I have talked that Lipo batteries are hard to care and not very safe, so we should know more knowledge about how to care Lipo batteries. These are long guides, if you are interesting in these, you can read this Lipo Battery Warning to know how to charge/discharging, storage and some others about care Lipo batteries.
Where to buy Lipo batteries?
Lipo batteries are also used to drones, RC cars, FPV and some other RC industries, if you want to buy one or more Lipo batteries, you can buy batteries online, it is a easy and useful way, and you’d better chose a right brand, because Poor quality Lipo batteries are not very safe, they maybe destroy your machine or hurt you, so a high quality and brand Lipo battery is very important. If you are a RC hobby or drone, FPV lovers, I recommend you can buy batteries on the www.genstattu.com , their batteries are high quality and safe, you can have a try.
Article Source: http://rcfpvplane.com/lipo-battery/