2018 GP250 not charging

[Wuzofoz]

I have had the bike 7 weeks and ridden every weekend. Prior to this weekend I have not had a problem with the e start. The lithium batt was flat when I picked the bike up so I charged it to 15v. Usually I see the dash show lower then full charge and I if I don?t use the fan this will increase to full. This ride the dash never showed less then full charge and battery was to flat to turn motor over. I used the kickstart to finish ride and stayed on tracks I didn?t need the fan for over an hour and still no e start.
Getting home I checked the battery and it had 12.1v in it. Charged it to 15v and starts fine. I also disconected the battery and checked volts on the lead and had 13.5v.
Has anyone else had charging issues?
Thx wuz