A205 Carrier Board CMOS Battery and Heat Sink Fan with Nvidia Jetson Nano

I’m running a Jetson Nano on an A205 carrier board. The board did not come with a CMOS battery. What battery do I need for this board? Also, the heat sink fan I had been using on my previous carrier board has a different fan connector. What fan should I use on the heat sink attached to the Jetson Nano module I have installed on the A205 carrier board?