Better understanding of portable lithium battery pack

Firstly I am a newbie in electronics. Been a software developer for over 10 years and I know my way around desktop hardware, but that's mostly it.

I am self-teaching robotics using Raspberry Pi. I bought this battery pack a few months back and it works well when connected directly to the Pi board.

However I would like to connect it to this motor controller which is in turn connected to the PI. Problem is this controller accepts + and - wires rather than USB.

I opened up the pack and I am hoping to get help here on understanding the bits and pieces of what I am looking.

Please see image attached

Firstly: what is the white material there and what is its purpose?

Secondly: this battery has two outputs: a USB one; the left side and an AC one; second from the right. Why is the AC output covered in white material?

Finally: how can I hack it so that it outputs two wires out of the AC or USB output?

 

Thanks Harald Kapp. Vielen Dank! I tried that a few months ago but wasn't a very serious try. I will re-try this week.

 

Hi Harald,

I did as you recommended; connected the wires of the DC output to the controller, however some strange issue is happening. As soon as I turn on the battery pack, it lights green then goes dead (almost like it's shorted).

However the same connection works just fine when connected directly to a motor and directly to this other motor driver I have. I am wondering if there' some programming on the PiBorg Reverse that conflicts with the battery pack. Any thoughts on your end?

Thanks again!