This is minimal Badge with minimal functionality: It just powers one SAO-Connector. But this with high efficiency. Instead of connecting a 3V coin cell directly it uses a TPS61021A boost converter. The TPS61021A can generate 3.3V from an input Voltage as low as 0.5V. When the battery gets more drains and the voltage drops, you still get 3.3V. This results in in an extended battery life. You could also use batteries, which do not work in other badges anymore, because of to low voltage.