CoinPower
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CoinPower Rechargeable Li-Ion Button Cells Technical Handbook

VARTA Microbattery is a leading manufacturer of batteries and provides professional support worldwide to customers to help them to design VARTA batteries into their applications. Quality, reliability, high performance and customer satisfaction are the main reasons for our leading position in the market. VARTA Microbattery provides solutions to major OEM companies for high-tech applications such as Bluetooth headsets, activity trackers, heat cost allocator devices, back-up for memory and the real-time clock in PCs/notebooks as well as alarm systems, medical equipment, consumer electronics...

Unless otherwise stated, specified values are valid for operation at room temperature 20°C ± 2°C. Specific Data The gravimetric energy density of the Li-Ion Coin Power series depends on battery size, and is in the range 180-210 Wh/kg. Volumetric energy density is in the range 370-410 Wh/l. Voltage Definitions Open Circuit Voltage (OCV): Equilibrium potential 3.0 V to 4.2 V on average, dependent on temperature, storage duration and state of charge. Nominal Voltage of Li-Ion cells is 3.7 V End of Discharge Voltage (EOD): The voltage at the end of discharging is nominally 3.0 V per cell, but...

VARTA CoinPower batteries are the first choice for a number of modern high-tech portable products. They provide a long lasting, reliable main power source which is lightweight and occupies a minimum of space in the host device. VARTA CoinPower batteries meet the most important design requirements of these products: Reliable high-power output, design flexibility with a minimum of space requirement and a round form factor.

1.3 APPLICATIONS VARTA CoinPower batteries are especially suitable for modern electronic applications such as Bluetooth Mono/Stereo Headsets, Sensors for Fitness/Sport/Healthcare, Smart Watches, Wearable Technology, Smart Car Keys and many more. These cells are the ultimate power source for your electronic devices and make your products smaller, lighter and more attractive. VARTA CoinPower provides outstanding performance and reliability, excellent quality along with very safe operation. In-Ear Headset Fitness Tracker Insulin Patch

1.4 GENERAL DESIGN AND APPLICATION CRITERIA Choose the most suitable battery from our range of VARTA CoinPower cells for the needs of your application and the conditions in which it is expected to operate. The most important criteria for the selection of battery type are these: ■ Required minimum operating time ■ Max. and average current drain ■ Min. and max. operating voltage ■ Operating temperature range ■ Mechanical properties ■ Available space ■ Environmental conditions You can choose a cell from the VARTA CoinPower range for operate within the following limits: Operating Voltage: 3.0 V...

1.5 CONSTRUCTION AND ELECTROMECHANICAL PROCESSES OF COINPOWER The housing of the CoinPower cells consists of two stainless steel parts. This gives the cell very high mechanical stability during assembly in the endproduct as well as during the product’s use by the customer. Inside the cell the anode, cathode and separator are wound to a coil. The connection of the electrodes to the housing is made by welding from the inside to the lid and cup. The innovative design of the housing, combined with its foil gasket, provides for the most efficient use of the space inside the cell for...

The CoinPower cell is available in six different diameters and two different heights (4.0 mm and 5.4 mm). See specification table below. Type Designation Voltage (V) Capacity (mAh) Diameter (mm) Height (mm) Weight (g) Model Number The model numbers are two uppercase English letters and a figure consisting of four digits. The version number consists of one letter and one figure as shown in the example below. CP 1654 A3 I I 1 P y 4 1 Battery Type (CP - CoinPower) 2 Cell Diameter (here: 16 mm) 3 Cell Height (here: 5.4 mm) 4 Version

In order to make every single cell fully traceable, a cell code is printed on the housing of each one. This code provides information about the production date, the version and the assembly line. The products are coded with a 7-digit code which refers to the day it was manufactured, the version and the assembly-line: Digit 5-6: Version (last two digits) Digit 7: Assembly Line (Line 1: A, Line 2: B, Line 3: C, Assembly Line 1 Assembly Line (letter A-C) Please note that this code is printed on every individual cell produced in Germany. The battery code is different, and is indicated on the...

3.1 CHARGING Most CoinPower types can be charged with various rates and with various charging profiles. In order to find the best solution for any given application, see the different options below. For more information please consult your Key Account Manager or use the contact information on the last page of this document. Detailed information about charging currents available in the respective datasheets. Standard Charging The standard charging profile for a CoinPower battery has a maximum C-Rate of 0.5C over the entire temperature range between 0°C and 45°C. The charging procedure must...

CoinPower A3 / cha. CC 2.0 C / 4.0 V / CCCV 0.5 C / 4.2 V / Imin 0.02 C // dis. 0.2 C / 3.0 V // RT 2C-Rapid Charge Procedure for CoinPower Comparison of Charging Procedures An overview of the various charging procedures and the related time and charged capacity can be found in the table below. Charged Capacity The A3-version can be rapid charged with a two-step procedure: A charging rate of 2C can be applied up to max 4.0V, before continuing at the standard rate of 0.5C up to 4.2V. The charging voltages should be controlled within tolerances of ± 50 mV. The charging procedure must be...

3.2 DISCHARGING Thanks to its coiled electrode design the CoinPower series can handle very high discharge currents without any damage or reduction in cycle life while operating with a very low voltage drop. The cell can be discharged at 2C continuous and 3C in pulse mode for 2s. This makes it possible to run power-hungry devices and to support even high pulse load profiles. The supported discharge current can be even higher than 3C for shorter durations than 2s. Discharge Temperature The cell should be discharged within a temperature range between -20°C and 60°C. Over Discharging If not...