^^ +1
You either have a drain or your battery needs replacement because it doesn't hold the charge.
The stator gives enough current to charge the battery at about 4-5k rpms. It doesn't need to be 11k rpm's.
If your commute is highway and at least 15-20 mins, that should be enough to keep the battery charged.
If it's stop and go traffic, I don't know.
I would start by taking out the battery, charge it and test it. Either get a trickle charger or take it to a shop.
Once you're sure your battery is good, try again. If it drains again, then you have to search for a drain or for a faulty component in the charging system, most likely the stator, but also the Regulator/Rectifier.
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