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Advanced SR technology supports emerging trends with various cell sizes and enhanced performance

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Maxell successfully commercialized their first SR (silver oxide) button battery in 1976. Manufacturing over 40 years in Japan, we have produced over 9 billion SR button cells, supporting the growth of small electronic devices such as quartz watches, handy calculators and medical devices.

Maxell continues to develop advanced SR technology to support new emerging markets and trends with various cell sizes and enhanced performance.

Key Component for Future Digital Health  
Micro batteries have good affinity with medical devices due to their small footprint and various chemistries.  Maxell technology optimizes cell performance based on requirements of device and application requirement.  In 2005, Maxell released ME927 (design for medical applications) that is designed for Capsule Endoscopy.  This application includes a small ingestible capsule containing a micro-camera which takes images while passing through the digestive tract and small intestine. New Maxell battery technology introduced a process to achieve medical reliability requirements while optimizing battery performance.

Table 1.  Battery Design Comparison SR/ME


In addition to Capsule Endoscopy, wearable medical devices for health monitoring continue to play an important role in resolution for life-style diseases such as diabetes, heart disease, and cancer.  For example, treatment of diabetes which involves monitoring of diet and physical activity along with maintaining blood glucose levels is accomplished by using Continuous Glucose Monitoring devices (CGM).

Preferable Battery for Medical Wearable Devices
The wearable health care device is connected via communication system and consists of a closed loop system around the body. Using Bluetooth is suitable with 2.4GHz transmitter due to recent advances in power saving technology and its affinity with devices like smartphones. The following are general requirements of the battery.

– Small footprint and thinness

– Energy density

– High load durability

– Long reliability

– Safety

Silver Oxide button battery (SR) is appropriate chemistry to manage these requirements. LR (Manganese dioxide zinc battery) is also known as the same aqueous electrolyte battery, however, SR is the better option technology and design for medical devices.

The most important point to consider for transmitting devices is that SR battery has flat voltage, and low impedance until the end of discharge.  BLE chipset has approximately 1.2V minimum voltage and with SR 1.55V high and flat working voltage, it promises consistent performance until life end with higher energy density.

Table 2.  Battery Design Comparison SR/LR


Battery Technology Features
High load durability is often required for the data transmission function on medical devices. Maxell’s ME927 shows high durability on high discharge.


* This is performance example. Maxell can provide the suitable solution upon each customer’s request.

Maxell Battery Product Lineup

Please visit at https://biz.maxell.com/en/primary_batteries/sr_coin.html for full product lineup.

Maxell Designs for the Future


As the need for digital healthcare increases, the requirements for smaller and more reliable power sources are critical to support these devices. SR technology button cell is an optimal power solution. Maxell continues to develop technology represented with SR button battery that will achieve the requirements for new evolving markets and devices in the digital healthcare industry.

– Miniaturization; Smaller & thinner battery is required for wearable device for quality-of-life perspective.

– Reliability; Power source needs to be accurate and consistent for health monitoring.

– High Load Durability; Extremely high pulse capability required for wearable drug delivery devices.

Please contact us at OEMBatterySupport@maxell.com for more information or visit us at https://maxell-usa.com/



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