Are Button Cells Rechargeable?

 rechargeable button cell batteries

What are the button cells?

Button cells are distinguished by their shape and come in a wide variety of sizes and thicknesses. They are generally larger in diameter and thinner than cylindrical batteries, such as AAA on the market. Consumers will also most often use and throw away their button-cell batteries without checking to see if they’re rechargeable or not.
We will further explore these characteristics and applications of button cells in this article.

Classification of button cells

Button cells are usually divided into rechargeable and non-rechargeable ones. The English letters on a button-cell battery represent the type of battery while the number represents the size. The first two digits represent the diameter, and the last two digits represent the thickness.
Most button cells are one-time-use (i.e non-rechargeable, also known as a galvanic battery).  They belong to the dry battery category although they are different from the general cylindrical batteries (AA, AAA, AAAA)
Rechargeable button cells (also known as secondary batteries) are usually built into the product, such as the case in small Bluetooth headsets.

Application

A variety of micro-electronic products carry button-cell batteries because of how little space they occupy, their lightweight, easy use, and long-lasting power supply (just to name a few).  These cells have a diameter ranging from 4.8mm to 30mm and a thickness ranging from 1.0mm to 7.7mm.
They are generally used for all kinds of electronic products as backup power.  Products include but are not limited to the following: computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controls, electric toys, cardiac pacemakers, electronic hearing aids, counters, and cameras.
rechargeable button cell battery application

Features of various types of button cells

Alkaline button cell

Due to this battery’s large capacity, excellent low-temperature performance, and a low price, it can meet the demand of large current continuous discharge requirements. Its shortcomings include its insufficient energy density and an unsmooth discharge voltage.
The alkaline manganese button cell uses manganese dioxide for the positive electrode, zinc for the negative electrode, and potassium hydroxide for the electrolyte. Its nominal voltage is 1.5V, and it has a good discharge effect although it is relatively expensive. The nominal capacity is 15mAh to 140mAh. It is mostly used in electronic toys, hearing aids, lighters, watches, and so on.

Silver Zinc Oxide button cells

This type of battery uses silver oxide as the positive electrode, zinc as the negative electrode, and an alkaline solution as the electrolyte. It can be made as either a primary battery or a storage battery. Due to the high cost of silver, it is mainly used as a button cell.
This button cell has a long life and large capacity, and it is widely used. It consists of silver oxide as the positive electrode, metal zinc powder as the negative electrode, and potassium hydroxide or sodium hydroxide as the electrolyte. Electrical energy is generated through the chemical interaction between zinc and silver oxide.
This button cell also has a higher capacity than carbon or alkaline button-cell batteries. It has good voltage stability. For instance, when the battery is at 90% of its capacity, the voltage is stable at 1.45V or more; when the battery has 10% of its capacity, rapid linear discharge is down. This battery has a leak-proof effect, and it is suitable for long-lasting use. It is commonly used in hearing aids, cameras, watches, calculators, and other applications.
In addition, button-cell batteries that use zinc electrodes, such as alkaline batteries, silver oxide batteries, zinc-air batteries, may contain mercury due to the manufacturing process. Therefore, it is necessary to observe whether the battery case is marked with mercury content.

Lithium polymer button cell batteries

These are the best of all the button-cell batteries especially since they are rechargeable and mercury-free. Currently, Grepow’s rechargeable button-cell batteries are lithium polymer batteries and are widely used in hearing AIDS, earbuds, thermometers, watches, and so on.  Grepow’s button-cell batteries can be specially designed to have a wide temperature range of -50℃ to 50℃ or -20℃ to 80℃.
rechargeable button cell battery GRP1054 rechargeable button cell battery GRP1254
At present, there are two models in mass production: GRP1054 and GRP1254. Others can be made according to your products’ size, discharge capacity or demand, cycle life, discharge current. Some other special requirements, such as fast-charging, low-temperature use.
If you want to know more about button cells, please continue to follow our blog.
If you are interested in our products, please contact us at info@grepow.com.
Official website: www.grepow.com

Can you replace battery in Bluetooth headset?

1. Can I replace the Bluetooth battery?

My favorite Bluetooth headset loses power quickly and the headset “dies” in the middle of a conversation. Can I replace the Bluetooth battery?
Typically, batteries cannot be replaced in Bluetooth headsets; however, this is dependent upon the headset you’re using. Contact us and we can help determine if a replacement battery is available for your BlueParrott, Jabra, Plantronics, Sennheiser, or VXi headset.

2. Is there a replacement battery?

The battery that came with my Bluetooth headset has been lost. Is there a replacement battery* available? *
Yes, we have lots of batteries for your Bluetooth headset. Simply find your headset by using the “Search” bar on our web site, find your battery, and click on the product listing. A complete list of available batteries will be displayed. If your headset has been discontinued, don’t despair! We have batteries for some older model headsets. Of course, we can also customize the battery for your Bluetooth headset– simply give us a call and we can help.

3. How do I pair my Bluetooth headset with a smartphone or tablet?

No matter which device you’re using, you will need to enable Bluetooth in the Settings menu of your device and your headset will need to be powered “on” and be placed in pairing mode. That way, the headset, and phone/tablet can communicate and connect (or, pair). Follow the prompts on the smartphone/tablet and pairing is complete.
NFC (Near Field Communication) pairing is also available for some phones and headsets. Contact us for additional help with pairing/connecting your Bluetooth headset to your smart device.

4. Is there a way to change the wearing style of my Bluetooth headset?

This is dependent upon the headset that you choose. Some headsets offer a choice in wearing styles; while others may have an add-on piece that can be purchased.

5. Can I use my Bluetooth headset with my laptop/PC?

Yes, provided you have a UC version of the headset. In plain English, a “UC version” is enabled to connect to a PC/laptop via the included Bluetooth dongle that will plug into your laptop/PC via USB. The dongle must be paired to the headset out of the box. Contact us to ensure you have a UC headset.
Bluetooth headsets are incredibly useful, and more intelligent than ever, with voice-activated commands in some models. When you have the right tools, taking and making calls, listening to music, and participating in webinars become second nature. Take advantage of these headsets to streamline your work and life! And with all of the wearing options available, the right headset is just waiting for you.
Contact us at info@grepow.com and we can determine the best Bluetooth headset battery for your needs.

Bluetooth headset battery

What Affects the Lifespan of LED Power Supplies?

LED
An LED power supply is a device that provides electrical energy for lighting and the components in a computer. It supplies are widely used in the following: street lights, tunnel lights, LED grille lights, LED indoor lights, LED ceiling lights, buildings, bridges, square construction facilities, lawn lights, curtain wall lights, display panels, dynamic billboards, simulations, stadiums, car indicators and internal reading lights, car brake lights, tail lights, turn signals, sidelights, explosion-proof lamps, mining lights, etc.
To avoid power failure, it is important to consider many aspects of an LED power strip from how the LED chips and power are installed to the space that the power strip will be installed in (is it a small space) and the heat dissipation.

Factors that affect the life of an LED power

Grepow believes that environment characteristics, components, and electrical characteristics are factors that affect the life of an LED power supply. These include the following:

The actual application of environmental

The actual application of environmental impact: high humidity, high temperature, dusty environment, strong magnetic environment, and vibrations.

Lighting and temperature environment

The impact of the lighting and temperature environment: lighting internal temperature <65 ℃, lighting shell<75 ℃, and power supply temperature < 60 ℃.

 The power supply grid

The impact of the power supply grid: unstable grid voltage input impacts the LED power components, thus affecting the life of the LED drive pulse.
Schematic diagram of LED drive power supply
Schematic diagram of the LED drive power supply

Insulation and installation

Insulation and installation of the impact: the correct installation of the product and good insulation will enhance the application of an LED power supply.

 Electrolytic capacitors

The influence of electrolytic capacitors: electrolytic capacitors will leak out of the sealing part of the electrolyte vaporization. It is generally believed that with every 10 ℃ temperature rise, the leakage rate will double.
Furthermore, the normal working life of an LED power supply depends on the life of the electrolytic capacitor, and the life of the electrolytic capacitor depends on the life of the capacitor itself and the working temperature.
The life of the capacitor at 65 ℃ can only guarantee about 80,000 hours and, at 75 ℃,  about 40,000 hours. The life of the capacitor at 85 ℃ can only guarantee about 20,000 hours and, at 95 ℃, can only guarantee about 10,000 hours. From the above example, it is clear that the life of the capacitor will be halved every time the temperature of the electrolytic capacitor rises by 10℃.

The impact of switching times

Most power supplies are equipped with capacitor input rectifier circuits. When the power supply is connected, inrush current will be generated, resulting in fatigue of the switch contacts. This in turn causes problems such as increased contact resistance and adsorption.
The peak value of the power when the LED power supply is turned on is tens to hundreds of times the rated value, which results in thermal fatigue of the resistor and a circuit break. Thermal fatigue resistors in the same situation will also produce thermal fatigue.
LED drive power supply has many advantages such as environmental protection, long life, high photoelectric efficiency (current light efficiency has reached 100LM/W), anti-vibration, etc. In recent years, applications in various industries have developed rapidly, and designers should deepen their understanding of LED drive power supply to improve the life of LED lamps and lanterns.
If you are interested in LED batteries, follow the link for more information: https://www.grepow.com/page/shaped-battery.html

Winding and Stacking of Cells

lithium batteries
The performance of lithium batteries is closely related to its manufacturing process and equipment. This article will analyze the process and characteristics of the winding and stacking methods.

Winding and stacking process

After the diaphragm is made into the core during the winding process, there is a large curvature of electrodes on the edges, which allows for easy charge and discharge. Deformation and distortion of the weaved layers can lead to degradation of battery performance and even safety hazards. In addition, during the cell-discharge process, the current distribution on both sides becomes uneven, the voltage polarization large, and the discharge voltage unstable.
Winding and stacking process
The other method for producing batteries, the stacking process, is more tedious as it is mainly cutting the electrode sheets and diaphragm into pieces: the process involves cutting the positive and negative electrodes, heat laminating, stacking, hot pressing and glue wrapping.  The qualified rate of electrode slitting is low, it is difficult to maintain a high degree of consistency, and the alignment accuracy is not high.
Winding and Stacking battery
In general, the winding efficiency is high and the process is simple, but the quality of the core is not as good as stacked sheets. Although the stacking machine can enhance efficiency through multi-station, the overall cost is still high and the consistency of the core is poor.

Winding Equipment

Winding equipment involves the automatic unwinding of the positive and negative electrode sheets and diaphragm, automatic dust removal, automatic winding of positive and negative electrode sheets, taping of termination tape, and other finished products. Modules such as automatic unloading, pre-pressure weighing, and QR code labeling.
For battery factories, the most important performance indexes for purchasing equipment are winding speed, tension fluctuation control, alignment accuracy, and overall qualification rate. The machines are capable of achieving the following: line speed of 3m/s, tension fluctuation control of ±5%, alignment accuracy of ±2mm, and failure rate.
Based on current machinery, winding equipment can achieve a line speed of 3m/s, tension fluctuation control ±5%, and alignment accuracy of ±2mm.  It can also achieve the following: the rate of qualified products ≥ 99%, time crop rate ≥ 98%, and a failure rate of ≤ 1%.

Stacking Equipment

The functions of this equipment include but are not limited to automatic electrode-diaphragm unwinding, automatic deviation correction, tension control, tab-smoothing and guiding, dust removal, electrode cutting, and feeding, hot pressing, and gluing, stacking, CCD positioning and stacking, gluing, weighing and labeling, etc. The process itself involves the positive and negative electrode and diaphragm rolls being unrolled by a servomotor, tension controlled and corrected, and then cut by an electrode-cutting device.
stacking equipment
The thermal compound mechanism sends the cut positive and negative monolithic and double-layer separators into the oven for preheating and then uses a Mylar membrane to protect the electrode pieces and separators during transportation. After that, they are directly cold pressed and cut into independent stacking cells.
The individually stacked sheet units are then transported to the CCD camera position. After being photographed and positioned, the position information is transmitted to the transfer robot. The stacking unit is stacked to the stacking table by suction cups on the robot after receiving instructions. After stacking the required number of layers of cells, the cells are directly transferred to the hot pressing platform to complete the hot pressing.
stacking technology process
After hot pressing, the cells enter the gluing station for a short-circuit test. Glue is then placed around the cells, and the cells are weighed, and code is applied on the surface to bind information.  The final NG product is automatically rejected and qualified products are retained.
The level of stacking equipment is currently the following: the overall alignment accuracy of the cell ± 0.5mm, the rate of qualified products ≥ 99.5%, time crop rate of ≥ 98%, failure rate ≤ 1%, and stacking efficiency (five stations) at 4 pieces/s.
If you are interested in our stacking batteries, please don’t hesitate to contact us at any time!
Email: info@grepow.com
Grepow Website: https://www.grepow.com/

Sweat-driven E-skin Pushes Development of Wearable Devices

Sweat-driven e-skin pushes the development of wearable devices. Wearable devices have been in the market for a while now, but the technology has not had any major breakthroughs.  In recent years, there have only been some changes in the commercial application of wearable products, such as smartwatches and bracelets.  Furthermore, the functions and applications of these basic commercial devices are limited, and there is still a lot more room for technological advancement.

E-skin power comes from the wearer’s sweat

There is huge potential in wearable devices both in terms of their application and product form. Currently, wearable devices only monitor and compile data on human movement and primary vitals.  They rely on rechargeable batteries to operate.
More recently, a new technology was published in the journal Science-Robotics, and researchers from the California Institute of Technology developed an electronic skin that can be fitted with sensors and powered by the sweat of the wearer.
This bio-cell sensor and wireless communication system is contained within a soft elastic rubber patch that fits directly onto the wearer’s skin, so we can think of it as an electronic skin-like wearable device.
The process of converting sweat into electricity

A significant impact on the smart-wearables industry

The emergence of this technology has significant implications on its industry.
First, it reflects how wearable devices are moving to be even more convenient and lightweight; secondly, at the application level, it is creating less of a barrier between people and objects; and, finally, at the operational level, the power is obtained by human sweat, which undoubtedly opens up future possibilities of wearable devices.
Furthermore, the new technology’s method of using electricity is a direction towards biofuels. It utilizes the concentrated lactic acid contained in our sweat – a byproduct of our metabolism that is absorbed by the fuel cells of the electronic skin and converted into electricity. These fuel cells are made of carbon nanotubes containing a platinum/cobalt catalyst and an enzyme that breaks down the lactate and is held by a composite mesh. The body’s exhaust mixes with oxygen in the surrounding air to produce water and pyruvate.
Experimental data of biofuel cell
From current experimental data, these biofuel cells could generate enough consistent energy to power sensors that monitor such things like heart rate, body temperature and blood sugar levels.

Wearable devices to the future

It can be foreseen that, with continued improvement of technology, smart, wearable devices will continue to militarize.
The emergence of e-skins also heralds a future where wearable devices, especially wearable medical devices, will move to being more closely integrated with our bodies and provide accurate data and real-time monitoring management.

Current wearable battery solutions

GREPOW is currently available for most wearable batteries. We have over 5000 special batteries for you to choose from. The thickness ranges from 0.4 mm to 8 mm. It means that the thinnest can be thinner than paper. All kinds of wearable devices you use on your body is perfectly fine with our special batteries.
From our inception, we have been cooperating with many of the top 500 companies in the world.
wearable batteries
Click the link for more wearable batteries’ information: https://www.grepow.com/page/wearable-battery.html
Contact us directly for more battery information: Contact us
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The Best LiPo Batteries for Portable Medical Devices

medical
Lithium-ion polymer (LiPo) batteries are a great power source for portable electronic medical devices.  They offer many advantages over other conventional technologies in portable medical device applications that include higher energy density, lighter weight, longer cycle life, better battery capacity retention characteristics, and a wider range of applicable temperatures.

The Importance of LiPo Batteries for Portable Medical Devices
As consumer electronics and many other industries are becoming mobile and portable, medical devices are no exception. This trend is driving the healthcare industry by improving the performance of on-site rescue equipment, monitor equipment, and medical devices.
patients and medical staff
Medical-device manufacturers not only need to consider the portability but also the reliability when making devices. A broken cell phone is annoying, but if a portable heart monitor device or infusion pump stops working due to a drained battery, the end-user – and the patient – faces a much more serious problem.
Just a few years ago, medical professionals were unable to bring life-saving equipment to emergency scenes because the technology of portable devices was not yet mature. But today, mass quantities of monitoring instruments, ultrasound equipment, and infusion pumps can be used outside of the hospital.
It is thanks to the application of such lithium polymer batteries technologies that bulky defibrillators, which weigh up to 50 pounds, can be replaced by lighter, more compact, user-friendly devices.
LiPo Batteries
The mobility of patients has also become more and more important. Patients today may be transferred from radiology to the intensive care unit, from an ambulance to the emergency room, or from one hospital to another by ambulance. Similarly, the popularity of portable home instruments and mobile monitoring devices allow patients to stay where they like, not necessarily in the healthcare facility. Portable medical devices must be truly portable in the full sense of the word to provide the best service to patients.
Due to the unique chemical properties, LiPo batteries have different design constraints than previous battery technologies, such as NiMH, NiCd, and sealed lead-acid (SLA). At the same time, medical devices have more stringent operational requirements than consumer electronics, so powerful battery packs with accurate charge monitoring and reliable batteries are needed.

Characteristics of lithium polymer technology for medical devices

High energy density

The main advantage of lithium polymer battery technology is its significant increase in energy density. LiPo batteries can store and release more energy than other rechargeable batteries that are the same size and weight.
Energy density is measured in terms of both volume and mass. Lithium polymer technology now offers a volumetric energy density of nearly 500Wh/L and a mass-energy density of 200Wh/kg.
Lithium polymer batteries operate at a higher nominal voltage than other rechargeable batteries.  They are typically around 3.7V, compared to 1.2V for NiCd or NiMH batteries. This means that when multiple other batteries need to be used, only one lithium polymer battery is enough. The higher the energy density of the battery used in the portable instrument, the smaller and more portable the instrument will be.

Battery shape

Lithium polymer batteries can also be made into different shapes and sizes and capacities. The reduced size of the battery means engineers can use the extra space to add more new features and customizations to the same product. Such as  Grepow shape batteries are designed to fit into any and all spaces in a product. In order to provide the best efficiency, Grepow batteries can be made to fit into even unused spaces. With our proprietary formula and high discharge-rate technology, you can maximize the run time and use of your product.
LiPo Batteries for medical devices

Self-discharge

The battery naturally loses its capacity. This phenomenon is known as self-discharge. However, most of its lost capacity can still be recovered if stored properly. Overall, LiPo batteries have very low self discharge compared to other batteries.
If you are interested in our products, please don’t hesitate to contact us at any time!
Email: info@grepow.com
Grepow Website: https://www.grepow.com/

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