Hi FearTec,
Welcome to the forum!!
PiJuice have an excllent guide which can be found here: How to Setup & Connect your PiJuice battery • Pi Supply Maker Zone
Bryce made some calculations on this forum post regarding the custom profile required to use the battery: 3-pin LiPo Battery for PiJuice 6000mAh (CE06797) - #3 by Bryce
There isnt an exact spec for the C rating (used to find the current output) but we’ll have to do a test to confirm it’s output current.
Liam.