With a bad battery you will never get a true voltage reading and any testing should be done with a fully charged battery.
You need to keep a close eye on things.
I don't know for sure if the 2012 is involved but the 1000 has trouble with the magnets on the flywheel moving, this can make the charge rate fluctuate.
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.