The FRDM-FXS-MULTI-B uses a MC34673 to charge the internal Li-Po Battery.
But the CHG Green LED never turns off, even if charged overnight. I tried removing J22, but that didn't help.
According to the MC34673 manual, this pin should go high (turning off the LED) once the battery is fully charged.
The PPR orange LED is on when I have the USB plugged in.
This sensor board is connected to a FRDM-KL25Z. It all works great when communicating via BlueTooth to my Samsung Galaxy Tab.