2018 XC 300 charging voltage
 

What voltage is the battery supposed to charge at while the bike is running?
I just put some dielectric grease in all of my electrical connections, now with the bike running my battery reads 13.12 and climbs very slowly. I thought it should be a higher voltage with the bike running and stator charging the battery?

The resting voltage for a lithium battery is ~13 V. Perhaps your battery is already sufficiently charged. My voltage when running at moderate revs is usually 14-14.5 V.

Maybe the grease is reducing electrical contact along the way if a connection is not totally firm.

The manual says 14.2v. Saying that my 2018 gp250 dose not charge over 13.5v and reads lower when running if battery charge is down

Try another volt meter.