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Long-lasting rechargeable batteries boast paper-thin width

Posted: 26 Jun 2014     Print Version  Bookmark and Share

Keywords:rechargeable batteries  lithium  Internet of Things 

STMicroelectronics has developed EnFilm, advanced rechargeable batteries that are less than 0.25mm thick. These batteries free designers from the constraints of standard battery sizes and target the next generation of personal technology and Internet of Things (IoT) devices.

At just 220µm thick and measuring 25.7mm x 25.7mm, ST's EFL700A39 EnFilm solid-state lithium thin-film battery is perfectly suited for use in ultra-low-profile devices. Surface-mount terminals allow direct attachment to the circuit board, which simplifies assembly and eliminates wires and connectors. Optional tape-and-reel packaging allows high-speed automated placement.


With 3.9V nominal voltage and 0.7mA capacity, the EFL700A39 can power a wide range of applications. Its lithium technology recharges rapidly from a 4.2V charging circuit and displays low capacity loss as well as long cycle life allowing some 10 years of use if charged once per day. The EFL700A39 is RoHS compliant and Underwriters Laboratories certified, satisfies United Nations tests and criteria for battery transportation, meets IEC 62133 safety specifications, and meets the ISO7816/IEC10373 mechanical and flexibility standards for smart cards.

ST is ready to fulfil orders for engineering samples and small production quantities, targeting applications including wireless sensor nodes, RFID tags, smart cards, wearable technology, non-implantable medical monitors, and back-up or storage for energy-harvesting devices. The unit price is $30 for orders of five units.

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