Get a VOM & connect it between the negative battery terminal & the lead itself, which means, the lead is disconnected, read current flow, switch off. Just to see if something is draining the batery with the switch off. Look the bike over for any lights still on when the key is in your pocket. NOt leaving the thing on accessory?

WHOaa Whoaa,, lemme get this straight,, you start the bike, ride 3 miles, start the bike, ride 3 miles & the battery wont hang with that>>>??? Maybe the charge system cant recharge the battery in 3 miles?? The answer, if thats what it is, is simple, ride around! Have some fun,, geee, sorry to break it to ya, but you gonna have to ride that thing some more,, aint that a shame??

3 miles isn't enough to keep anything charged.

Heard this before only it was a diamond dealer driving a mercedes 5 minutes to the shop and back.

maybe if you kept it in 1st gear all the way.  

either take the long way to work or get yourself a tricle charger.

charging times per ssm
battery age/charging time@1.4 amp max current for oem battery
<6 mo /20hr
<9/30
<12/40
>12/60

I bet one of the stator leads is dead.  
90% sure without seeing the bike You have a stator issue.