Basic Assembly and Setup

I saw the forum related to the battery however I'm still a bit confused. I'm not sure if the post is for the Nybble or Bittle. The USB to micro USB cable that came with Bittle can be plugged into the battery as well. And the power that comes out of USB port on a PC is 5V and 0.9A so why can't we use the USB port on the PC to power up the battery on Bittle?

I ended up getting this https://leeselectronic.com/en/product/1111-raspberry-pi-power-supply-5v-1a-usb-port.html Is this the right charger for charging Bittle? Along side with the USB to micro USB cable that came with Bittle.