Just found this thread so adding to it
2015 S1K, had the Biketrac fitted by BMW Park Lane when purchased new.
Really like the product but repeated problems with it draining the battery. I do store the bike in an underground locked garage, so I thought this was the issue. Within a year the battery wouldn't hold a charge so I replaced it.
Just had the bike in to BMW due to a failed radiator (separate post in Garage - BMW Park Lane fixed under warranty and said they hadn't seen the problem before), and asked them to remove the tracker. The Park Lane team said they had problems with the BikeTrac units draining the battery, and now recommend and install Datatool.
I called BikeTrac. They said the battery drain happens only if the device is installed improperly, "must have the brown wire connected to the correct side of the system" (seriously?). The system wakes up every 4 hours, tries to send a message. If no success (eg because out of coverage) then it goes to sleep for 4 hours. Not a lot of load so the system should run on the device's own battery for 30 days before needing any more juice from the bike. They say the bike would need to sit for more than 6 months to drain the bike's battery.
Also said I could find a BikeTrac service centre on their website, to install properly. I check and - Park Lane no longer listed (surprise) but other SE BMW dealers are still there.
So here are my choices: the tracker is buried deep in the bike, so it's hard for a thief to disconnect, but that means I need to pay a couple hundred quid for somebody else to burrow in or else I spend a day with my lesser skills doing the same. All to switch the wires over. Or pay BMW ?375 for a Datatool unit plus installation. Or just leave it and be sure to ride the bike every 3 days. I don't have a wall plug where I store the bike so trickle charge is not an option.
Somehow I choose the 'ride it every 3 days hell or high water' option