I highly recommend a voltage monitor light. since I added one to me versys it has helped me recently. when the bike is off and not running the light slowly blinks yellow or red indicating a normal battery strength, if it goes full red then the battery is low. with it running it is solid green. blinking green if I'm using a bunch of accessories but still acceptable charging voltage. if it blinks yellow or red then it is not charging.
yesterday it warned me that it couldn't keep up so I had to turn down the heat on my heated grips.
i'll see if I can dig up a link to one like I have.
edit:
this is the exact one I have
http://www.ebay.com/itm/190944256307...%3AMEBIDX%3AIT
I leave it on setting 3