Aa somebody who has used a OP6, the battery becomes more accurate after a few cycles. At first, my battery reported 50% when it was actually close to zero (I thought pmOS was giving it magic battery life for a bit since it lasted nearly the day of medium use before going to 50%), but after it was fully charged up (wiki says to leave it charging for some time) the indicator seems to be more accurate.
If you have any issues, the Matrix channel is super helpful! When I ran into a problem involving the installation of the unstable edge kernel (which was never meant to be on the wiki), I was guided towards how to fix it and the wiki was updated almost immediately