Originally Posted by Dirty bike
This is the issue. The 550 has an internal battery, there is no reason to have it on un-switched power. Even off, it's likely drawing current.
GPS was not on the bike for any of this time. But I suspect you're right, the cradle may have a short somewhere. However, the same style cradle on my DRZ does not drain its little battery and it sits for a month at a time without being ridden.