Tiny new Li-Ion cells target Bluetooth and wireless applications

Varta has expanded its CoinPower Series of lithium-ion rechargeable micro batteries to further enhance design flexibility, manufacturing efficiencies and cost effectiveness in Bluetooth, wireless, wearable, industrial and medical applications. Now consisting of CP 1254 A2, CP 1654 A2 and CP 1454 A3 parts, the series supports a voltage level of 3.7V and capacities of 50mAh, 100mAh, and 85mAh, respectively. Devices boast six patents including the iLock system, which together with an efficient circular form factor, facilitates an energy density of up to 30% higher than any comparable micro battery available, says the company. The series features low self-discharge and reliable signal transmission at high pulse loads to ensure unparalleled dependability, an extended shelf life of more than one year, and a fast charge capability to provide hours of battery life in just 15 minutes of charging. Additionally, the button cells may be recharged over 500 full cycles while maintaining at least 80% of their initial capacity. The CoinPower Series of Li-ion rechargeable micro batteries meets the safety, reliability, size and weight requirements of a broad spectrum of applications, including stereo and mono Bluetooth headsets, notebook bridging, wearable fitness monitoring and training devices, wireless sensor networks, energy harvesting backup, and medical and healthcare equipment, e.g., including insulin pumps. The series is also suitable for employment in smart watches, digital and analog watches, electronic games and car keys. The button cells are offered in diameters ranging from 12.1mm to 16.1mm, and weigh from 1.6 g to 3.2g. All parts measure 5.4mm high. They use the CC/CV (constant current-constant voltage) charging method and exhibit virtually no swelling over lifetime due to their dent and scratch resistant stainless steel case. The CP 1254 A2 and CP 1654 A2 cells are certified to IEC 62133 and UN 38.3 standards, whereas the CP 1454 A3 cells' certification is pending.