There are many advantages to using Lithium-Ion Polymer (LiPo) batteries: High working voltage, high energy density, long cycle life, low self-discharge rate, and no memory effect. To fully utilize these aspects of LiPo batteries, users should aim to prolong the life of their batteries. In order to do so, LiPo batteries should not be overcharged or discharged as explored in this article.
Activating LiPo Batteries
Some may have heard that new LiPo batteries need to be “activated” and thus charged for more than 12 hours. This is sometimes commonly heard amongst people who have new mobile devices and consequently drain and charge their battery for 12 hours. This might have been true when Nickel batteries, such as Nickel-metal Hydrogen (NIMH) or Nickel Cadmium (NiCd) batteries, were the predominant power source for mobile devices; however, most mobile devices now use Lithium-ion batteries. Users do not need to drain and charge their mobile devices in such a manner anymore.
Do batteries need to be activated? Yes, but this process is completed by the manufacturer and has nothing to do with the user having to do so. The actual process involves charging the batteries at 0.02C and then charging them in standard charge and discharge cycles to check for certain standards, such as the internal resistance, voltage retention, and maximum capacity.
Overcharging
One of the most common ways that LiPo batteries are abused is in how people overcharge their batteries. If users leave their batteries charged for too long, the batteries can become damaged, performance can be lost, and the life span of the batteries can decrease.
Fortunately, there are many chargers that automatically stop charging a Lithium-ion battery when the battery is fully charged. However, there are some devices that do not stop on their own, so users should exercise caution in order to prolong the life of their batteries. Ultimately, shallow charge and discharge are beneficial to LiPo batteries.
There are also safety concerns especially when users use Lithium-ion batteries incorrectly. They can become too hot if they are overcharged As shown by the many videos online, explosions can even occur if users are not careful. Users should refer back to the instructional and cautionary guidelines behind the products that they are using.
Lithium batteries, or Lithium-ion Polymer (LiPo) batteries, are batteries that use Lithium as a negative electrode material and use a non-aqueous electrolyte solution. In 1912, Lithium metal batteries were first proposed and studied by Gilbert N. Lewis. In the 1970s, M.S. Whittingham proposed and started researching Lithium-ion batteries. However, due to the complications of using the unstable Lithium metal, the batteries were not popular at the time.
It is now with further development that Lithium-ion Polymer batteries have fast become a preferred power source for many applications and industries. It is for this reason that we will explore the charging cycles of lithium-ion polymer batteries in-depth in this article.
What is a charging cycle?
Some consumers may have that the charge and discharge life of lithium-ion polymer batteries is “500 times.” But what is “500 times?” It refers to the number of charge and discharge cycles of the battery.
Let us look at an example: Let us say there is a lithium battery that uses only half of its charge in one day and is then charged fully. On the next day, it again only uses half of its power. Although the battery has been charged twice, this does not count as one charge cycle but two.
A charging cycle is when a battery goes from being fully charged to empty and then from empty to fully charged; this is not one single charge. Just based on the previous example, it’s clear that it can usually take several charges to complete a cycle.
Every time a charging cycle is completed, the battery capacity decreases a bit. However, the reduced capacity is very small. High-quality batteries will still retain 80% of their original capacity after many cycles of charging. Many lithium battery products will still be used after two or three years. Of course, after the end of the lithium battery life, it still needs to be replaced.
Ultimately, a 500-cycle life means that a manufacturer has achieved about 625 recharge times at a constant discharge depth (such as 80%) and reached 500 charging cycles. In other words, if we ignore other factors that could reduce the Lithium-ion battery capacity and we take 80% of 625, we receive 500.
However, due to various factors in life, especially considering how the depth of discharge (DOD) during charging is not constant, “500 charging cycles” can only be used as a reference to battery life.
Overall, it is better to think of the life of the lithium battery as related to the number of times the charging cycle is completed and not as directly related to the number of charges.
Deep and shallow charging
Here is another way to think of the cycle lives of lithium-ion polymer batteries: the life of a Lithium battery is generally 300 to 500 charging cycles. Assume that the capacity provided by a full discharge is Q. If the capacity reduction after each charging cycle is not considered, lithium batteries can provide or supplement 300Q-500Q power in total during its life. From this we know that if you use 1/2 each time, you can charge 600-1000 times; if you use 1/3 each time, you can charge 900-1500 times. By analogy, if you charge randomly, the number of times is uncertain. In short, no matter how a Lithium battery is charged, it is constant to add a total of 300Q to 500Q of power. Therefore, we can also understand this: the life of a Lithium battery is related to the total charge of the battery and has nothing to do with the number of charges. The effects of deep charging and shallow charging on lithium battery life are similar.
In fact, shallow discharge and shallow charges are more beneficial to lithium batteries. It is only necessary to deep charge when the power module of the product is calibrated for lithium batteries. Therefore, lithium-ion-powered products do not have to be constrained by the process: they can be charged at any time without worrying about affecting the battery life.
Effects of temperature on battery life
If a Lithium-ion Polymer battery is used in an environment higher than the specified operating temperature (above 35℃), the battery’s power will continue to decrease. In other words, the battery’s power supply time will not be as long as usual. If a device is charged at such temperatures, the damage to the battery will be greater. Even if the battery is stored in a hot temperature environment, it will inevitably cause damage to the battery. Therefore, it is a good idea to extend the life of lithium-ion polymer batteries by using it under normal operating temperatures as often as possible.
If you use Lithium batteries in a low-temperature environment (below 4℃), the battery life will also be reduced. Some older Lithium batteries of mobile phones cannot even be charged under low temperatures. However, unlike in high temperatures, once the temperatures rise, the molecules in a battery will heat up and immediately return to the previous charge.
Having explored battery performance under these extreme temperatures, the question now becomes if there are any batteries that can be used in environments with low or high temperatures.
Currently, GREPOW’s batteries can be used at temperature ranges of -50 ℃ to 50 ℃ or 20 ℃ to 80 ℃. Our low-temperature Lithium batteries’ discharging current of 0.2C at -50℃ is over 60% efficiency, over 80% efficiency at -40℃, and around 80% efficiency at -30℃.
The graphs source by Grepow Low-temperature lithium batteryThe graphs source by Grepow Low-temperature lithium battery
Charge-discharge cycle
To get the most out of lithium-ion batteries, you need to use it often so that the electrons in the Lithium batteries are always in a flowing state. If you do not use lithium batteries often, please remember to complete a charging cycle every month and do a power calibration, i.e. deep discharge and deep charge, once.
After the nominal number of charge and discharge cycles is used up, a battery’s ability to store power will drop to a certain level, but the battery can continue to be used.
Lithium batteries have no limit on the number of times they can be recharged. Regular manufacturers can charge and discharge batteries at least 500 times, and the capacity is maintained at more than 80% of the initial capacity. If charged and discharged once a day, batteries can be used for two years. Usually, batteries in mobile phones are charged 1000 times or more, which causes the batteries to be severely non-durable.
Below is a proper method of maintaining your mobile device’s battery:
When you charge your phone, fully charge it each time.
Do not fully discharge the battery. The battery needs to be charged when the power is less than 10%.
Charge with the original charger; do not use a third-party charger.
Do not use your mobile phone while it is being charged.
Don’t overcharge: stop charging after the battery is full.
According to the experimental results, the life of a lithium battery continuously declines with an increase in the number of charges.
Lithium battery cycle specified by the national standard
In order to measure how long the rechargeable battery can be used, the definition of the number of cycles is specified. Actual users use a wide variety of tests because tests with different conditions are not comparable, and the comparison must define the definition of cycle life.
Lithium battery cycle life test conditions and requirements specified by the national standard are as follows:
Charge at 1C under the environment temperature of 20 ° C ± 5 ° C. When the battery terminal voltage reaches the charging limit voltage of 4.2V, change to constant voltage charging until the charging current is less than or equal to 1 / 20C, stop charging, leave it for 0.5h to 1h, and then discharge it at 1C to the termination voltage of 2.75V.
After the discharge is completed, leave it for 0.5h to 1h, and then perform the next charge and discharge cycle two consecutive times. Less than 36min, the end of life is considered, and the number of cycles must be greater than 300 times.
Having gone over the national standard, we should explain the following:
The standard specifies that the cycle life test is performed in a deep charge and deep release mode.
The cycle life of the lithium battery is specified. According to this model, the capacity is still more than 60% after ≥300 cycles.
However, the number of cycles obtained by different cycling systems is quite different. For example, the other conditions above are unchanged, and only the constant voltage of 4.2V is changed to a constant voltage of 4.1V for the cycle life of the same type of battery. In this way, the battery is no longer under a deep charge, and the cycle of life can be increased by nearly 60%. Then if the cut-off voltage is increased to 3.9V for testing, the number of cycles should be increased several times.
With regard to this statement that the charge and discharge cycle is one less life, we should pay attention to the definition of the charging cycle of a lithium battery: a charging cycle refers to the full charge of the lithium battery from empty to full, and then from empty to full the process of. And this is not the same as charging once.
In addition, when we talk about the number of cycles, we cannot ignore the conditions of the cycle. It is meaningless to talk about the number of cycles aside from the rules because the number of cycles is just a way to measure battery life.
At the start of the 21st century, Bluetooth was considered to be a relatively new invention. The creation of this modern technology provided consumers with a glimpse into the world of wireless communication. The very first consumer Bluetooth product was a mobile headset that required no hands to operate. The product received phenomenal reviews among consumers, and, shortly after the immense success of the first product, the marketplace soon flooded with other Bluetooth inventions. The invention of Bluetooth soon proved to be a more economical and more efficient method of communication.
Creation of the Bluetooth Headset
Being the first Bluetooth product to hit the marketplace, the Bluetooth headset paved the way for immense technological advancements in its field. The modern invention of a hands-free headset allows consumers to communicate without the use of pesky wires and cables that can easily become tangled. Gone are the days of struggling to untangle wires and accidentally yanking the cable out of the device. Over a short distance, radio waves are capable of replacing cables or wires in connecting Bluetooth-enabled products, allowing customers to connect or ‘pair’ their two devices and use them to enjoy wireless communication.
In the modern era, Bluetooth headsets are increasingly favored over other wired headphones and earbuds. The most crucial proponent of popular technology is the lack of wires and cables. Moreover, its lightweight design and sleek, modern shape increase its likability among consumer demographics. Finally, the marketplace offers a variety of different brands and models of Bluetooth headsets, giving consumers a wide variety of options.
The Battery for Bluetooth Headsets
The majority of successful Bluetooth headsets are designed with versatility and durability in mind. The headsets strive to be lightweight, sleek, and as compact as possible. Although lightweight models of Bluetooth headsets are favored over bulky ones, a compact headset leaves little room for one crucial element: the battery.
The battery is the heart of any Bluetooth product. Without a battery to power the device, the combination of a lack of wires and cables leads to a useless piece of modern technology. This element of a Bluetooth headset leads to one decisive drawback of lightweight designs: a minuscule Bluetooth headset battery capacity.
The smaller the headset, the less space there is to place a battery. Does that mean you must sacrifice a contemporary and compact design for a bulkier one with increased battery life? Not necessarily.
A typical battery either has a rectangular or circular shape, depending on the specific size of a device. Smaller devices, such as a Bluetooth headset, would require circular batteries to operate. Larger headsets would require the power of larger rectangular batteries. Due to the popularity of small Bluetooth headsets, most models use small circular batteries that have a capacity range from 80 mAh to 150 mAh. Moreover, the compact size and unique design of the headsets cause a size restriction that leads to an inability to house larger batteries; this leads to Bluetooth headsets with short battery life.
Custom sizes and shapes
GREPOW is a company based in Shenzhen, China that is rapidly remedying the issue of standard-sized and shaped batteries. After immense research and development, GREPOW has created batteries of a variety of sizes and shapes that can fit into the unique designs of modern Bluetooth technology. The lightweight and compact designs of Bluetooth headsets are no longer a barrier in regards to the size and shape of the required batteries.
GREPOW is a company that understands that as the world continues to modernize, technology must change right alongside it. That is why GREPOW is the proud manufacturer of different Bluetooth headset battery shapes. With GREPOW’s research and technological advancements, Bluetooth headsets are now able to use the space of their devices more efficiently, utilizing unique battery shapes to give consumers an extended battery life.
Modern Issues Require Modern Solutions
GREPOW offers consumers some different options for battery shapes of Bluetooth headsets:
With the diverse selection of battery shapes, gone are the days of Bluetooth headsets with short battery life. Unique headset shapes now have unique battery shapes to accompany them in utilizing space efficiently and giving consumers devices with extended battery life. If your headset has a one-of-a-kind shape, GREPOW is capable of customizing a battery shape that fits your headset. Moreover, customers are also able to customize the smallest details within a battery including capacity and voltage. With the modern technological abilities of GREPOW, wasting space inside of a headset is no longer a viable option.
GREPOW Batteries
The batteries that GREPOW manufactures not only have unique shapes, but they also have high output power and capacity while continuing to be compact, durable, and lightweight.
For example, GREPOW battery model GRP6530027 has a capacity of 430 mAh while still maintaining a compact and round shape. Furthermore, this battery has a 3C discharge rate, 4.35V high voltage, and a very lightweight of 7.7gram.
GREPOW batteries can also be customized with different performances, such as low-temperature use, ranging from -50℃ ~ 50℃, or high-temperature use of 20℃ ~ 80 ℃. They can also be packed in series and/or parallel combinations and be able to integrate power solutions upon customer’s requests. Many testing requirements, including ROHS, SGS, CE, UL, IEC, CB, UN, etc., are met as well.
If you purchase a GREPOW battery, you are guaranteed a lightweight and compact battery with high energy density and long battery life. Along with that, each customer has the guarantee of quality assurance, high consistency, and after-sales services.
Make the switch to a GREPOW battery to experience modern technology at its finest.
