Powerflex Mk4 - Non
Join Date: Jul 2011
Location: United Kingdom
The obvious issue would be no alarm or immobiliser while its parked (aside from the disconnected battery, which in itself is an immobiliser!)
Try one of the plug in solar chargers. There a few threads on here about this as a solution for leaving it standing. You can plug it into the accessory socket, leave it on the dash and it will trickle charge the battery while its parked.
Check the threads for details / advice and issues though. I have never fallen foul of this issue so have not needed to do it.