I have an older model trailscout, it does eat batteries.
Depending on the cold weather, batteries can last between 14-30 days.
I have rigged up an external rechargable 6v battery setup, it is a 6v 14ah.
Iam not done testing yet, but this battery does last longer.
One thing you will need to know is: what is the voltage on this new trailscout, i think they are still 6v. Also the new trailscouts have an external jack, for a solar panel, to keep it charged.
Good luck.