From Spektrum:
The innovative Smart connection is made possible by an installed microchip on every battery, feeding the unique information through a data cable to the new IC3 and IC5 connectors. The IC series of connectors are designed from the ground up to provide a more solid connection, higher heat resistance, and effortless installation. Sprung bullets ensure a solid connection that is easy to connect and disconnect, while the convenient solder pads allow for easy installation on your device.
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