How to extend battery life and why use frequently can keep the battery best performance?

If the traditional Ni battery is charged for too long, the liquid inside would crystallize. In the way, to maximize the performance, the full charge and discharge are required. However, for the 2 cell Lipo battery, we can charge it whenever we are convenient.

It is a false about the lifespan of lipo battery that we should replace the lipo battery after charged for 300-500 times.

Instead, the factor influenced the lifespan is the charging cycle, and the times of charging will not directly influence the lifespan.

A charging cycle refers to the period from full power to the completely empty power and then fully charged. That does not mean charging for one time, as the following picture shows.

According to the picture, the battery is charged for 20% after the first time 40%. Then, after consumed some power, it is charged by 30% and 20% separately. In the half of this 20% (at the time of 10%), a charging cycle has been finished. And then, the next cycle begins.

For example, the first day, we charge the battery after consumed half of the power, and the second day, we repeat that process. This is just one charging cycle rather than two. Therefore, a cycle may be finished by several times of charging. Every single charging cycle will reduce the power slightly. However, a superior battery can maintain 80% power after many charging cycles. That is why some lipo battery can use normally after two or three years. Certainly, it is also needed that we replace the lipo battery if the lifespan has ended.
The lifespan of lipo battery is commonly 300-500 charging cycle. We set the Q as the power provided by one-time fully discharging. Ignoring the reduction of every charging cycle, the lipo battery can power 300Q-500Q through its lifespan. Accordingly, if we charge the battery after consuming ? power, the battery could be charged for 600-1000 times. (if we charge the battery after consuming 1/3 power, the battery could be charged for 900-1500 times.) we cannot tell the exact number of charging times if we charge randomly. In a word, the total power 300Q-500Q is constant. Therefore, the lifespan is related to the total charging power rather than the charging times. Besides, the difference between the influence of deep charging and discharging and the influence of light charging and discharging to lipo's lifespan is similar.

In fact, light charging and light discharging benefit more to the RC lipo battery. Only when the lipo battery is calibrated by the product has the need to charge and discharge battery deeply. Therefore, we can use the lipo battery for convenience and do not have to concern about the lifespan.

If the lipo battery is used above the regulated temperature (over 35 degree centigrade), the power will continuously decrease, which means the flight time would not be so long. If charged under the high temperature, the battery would be further damaged. It is unavoidable that storing under the high temperature will hurt the battery's quality.
If using below the 4 degree centigrade, you would also find the flight time of the battery has been reduced, and even some original lipo batteries of mobile phones cannot be charged. But, this situation is just temporary. Differ from using in the high temperature, once the temperature gets higher and the molecules inside the battery are heated, the battery would recover to the normal energy.
To maximize the performance of lipo battery, we should use it more often and make the electron flow. If we cannot use the lipo battery frequently, please remember to make a charging cycle and calibrate it (charge and discharge deeply) every month.
Source: http://www.genstattu.com/blog/how-to-extend-battery-life-and-why-use-frequently-can-keep-the-battery-best-performance/

What are the precautions for li-po battery?

According to the electrolyte materials that are used in Lithium Ion Batteries,Lithium Ion batteries are divided into Liquified lithium-Ion battery (abbreviation:LIB) and Polymer Lithium-Ion Batter (abbreviation:PLB) ,It used in the PLB cathode materials and LIB is the same, the anode materials are divided into cobalt acid lithium, manganese acid lithium, ternary material and lithium iron phosphate material, negative extremely graphite, working principle of the battery is almost the same.Their main difference is that the different electrolytes, LIB using liquid electrolyte, PLB with solid polymer electrolyte as a substitute for, at present most of the polymer gel electrolyte.

1.classification

solid

Solid polymer electrolyte of lithium ion battery electrolyte for the polymer with a mixture of salt, the battery the ionic conductivity at room temperature is low, can be used at room temperature.

gel

Gel polymer electrolyte for lithium ion batteries is in solid polymer electrolyte adding plasticizer and other additives, thus improve the ionic conductivity, the battery can be used at room temperature.

polymer

Polymer lithium ion battery having a thin shape, and of any area of any shape, etc., so you can use plastic composite film manufacturing the battery case, which can improve the ratio of the entire battery capacity; polymer lithium ion battery can also be high molecule as cathode material, its quality will be improved by more than 20 percent more energy than the current liquid 2200mah lipo battery.

2.Do not charge overcharge

Polymer lithium-ion battery, if the charging time is too long, will increase the possibility of expansion.

3. Advantages and disadvantages Advantage

A. single battery voltage up to 3.6v ~ 3.8v 1.2V voltage is much higher than the nickel-metal hydride and nickel cadmium batteries.

B. capacity density, and its capacity is 1.5 to 2.5 times the density of nickel-metal hydride batteries or nickel-cadmium batteries, or higher.

C. Self-discharge, place a long time after the loss of its capacity is small.

D. Long life, the normal use of the cycle life can reach more than 500 times.

E. no memory effect, before charging is not necessary to vent the remaining capacity, easy to use.

F. Good safety performance

Polymer lithium aluminum flexible packaging structure adopted in the event of safety problems occur, polymer batteries will not explode, it will only drums.

4. small thickness, can do thinner

Slim, the battery can be assembled into the credit card. Ordinary liquid lithium using the first custom shell, after the Cypriot village of positive and negative material method, the thickness of 3.6mm or less technical bottlenecks do exist, and the thickness of the polymer batteries can be done 1mm or less.

5. Light weight

Using a polymer electrolyte battery without metal shell as protection packaging.5000mah lipo 2s battery weight compared with the same capacities of steel lithium, 40% lighter, 20% lighter than aluminum battery.

6. The internal resistance

Polymer batteries internal resistance than ordinary liquid small core, the current domestic polymer batteries internal resistance of 35mΩ can do even less, greatly reducing the battery from the power to extend the standby time, can be achieved with the international level. This support large discharge current lithium polymer is ideal for remote control model as the most promising alternative to nickel-hydrogen battery products.

7. The shape can be customized

Manufacturers need not be limited to standard form, it can be economically made of appropriate size. Polymer battery can be added according to customer demand or reduce the thickness of the batteries, the development of new models of batteries, cheap, mold cycle is short, and some can even be tailored according to the shape of a mobile phone to take advantage of the battery housing space, improve battery capacity.

8. Excellent discharge characteristics

Polymer battery with gel electrolyte, compared to liquid electrolyte, gel electrolyte having a stable discharge characteristics and higher discharge platform.

9. Plate Design Simple

As a result of polymer materials, batteries no fire, no explosion, batteries itself has adequate security, thus protecting the circuit design polymer battery can be considered omitted PTC and fuse, thereby saving the cost of the FPV battery.

10C 15C 20C Lipos - What does the C mean

How quickly a battery can discharge is it's maximum current capacity. Current is generally rated in C's for the battery. C is how long it takes to discharge the battery in fractions of an hour. For instance 1 C discharges the battery in 1/1 hours or 1 hour. 2C discharges the battery in ? or half an hour. All RC batteries are rated in milli Amp hours. If a battery is rated at 2000 mAh and you discharge it at 2000mA (or 2 amps, 1 amp = 1000mA) it will be completely discharged in one hour. The C rating of the battery is thus based on its capacity. A 2000mAh cell discharged a 2 amps is being discharged at 1C (2000mA x 1), a 2000mAh cell discharged at 6 amps is being discharged at 3C( 2000mA x 3). I think gens ace lipo is best choice, they are the proffessional manufacturer of Lipo battery.


Currently LiPo technology does not allow currents as high as NiCad or NiMH batteries do. For this reason, this many LiPo batteries are put in parallel to increase the present capacity of the battery pack. When 2 batteries are wired positive to positive and negative to negative they become like one battery with double the capacity. If you have 2 2000mAh cells and you wire them in parallel then the result is the same as 14000mAh cell. This 4000mAh cell has the same C rating as the original 2000mAh cells did. Thus if the 2000mAh cells could discharge at a maximum of 5C, or 10 amps then the new 4000mAh cell can also discharge at 5C or (4000mA x 5) 20 amps. This method of battery pack building allows us to use LiPo batteries at higher currents than single cells could produce.

The naming convention that allows you to decipher how many cells are in parallel and how many are in series is the XSXP method. The number in front of the S represents the number of series cells in the pack so 3S means it's a 3 cell pack. The number in front of P means the number of cells in parallel. So a 3S4P pack of 2100mAh cells has a total of 12 cells inside. It will have the voltage of any other 3s lipo 5000mah since the number of cells in series determines the voltage. It will have the current handling of 4 times the maximum C rating of the 12 individual cells. So say our 3S4P lipo pack had a maximum discharge of 6C. That means that it has a nominal voltage of 10.8 volts (3x3.6) and a maximum discharge rate of 50.4 amps (2100mAh x 6Cx4P ).

The maximum continuous current delivering capability of a battery can be determined by multiplying the C-Rate X (mah of battery).

A 2000mah, 20C battery would be capable of delivering 40000ma (40A).
A 2000mah, 25C battery would be capable of delivering 50000ma (50A).

That's in a perfect world - however, there are no standards for how a manufacturer/vendor decides how to C-Rate their batteries. The big boys like Enerland probably do a good job of accurately descrbing the C-rate. Other pack makers may be another matter. They may call a real 15C pack a 25C pack in order to sell more. You just have to go by the RCG reports on the packs to get some idea on how accurate the C-rate is.

The other side of the coin is flight time. To get a 10 min flight, the average C-Rate draw needs to be 6C. A 20C pack operated at 20C will last a max of 3 min flight time and you'll maybe get 50 cycles out of it at the best.

Here is a good rule of thumb to go by.

3min flight to 80% drain = 16c avg and it can peak 32c = use 30c+
4min flight to 80% drain = 12c avg and it can peak 24c = use 25c+
5min flight to 80% drain = 10c avg and it can peak 20c = use 20c+
6min flight to 80% drain = 8c avg and it can peak 16c = use 15-20c+
7min flight to 80% drain = 7c avg and it can peak 14c = use 15c+

For me, high C-rates (>15) have no value as I want at least 8-10 min flight time. However, I'll take them if the price differential is small as it generally means a battery with a lower IR.