Hi. I don't own a Viper but I had a brand new Subaru STI back in 2008 that had the same issue. Battery died after just few days without the car being started. 3-5 days. The Subaru dealership told me the problem COULD BE related to the keyless entry/engine start system. My STI was the only one with that system at the time and no other Subaru or STI had this issue. When the car was in the garage, the key was hanging near by, that meant the keyless system was on stand by, draining battery. I never got to really test if this was the case or not, since I couldn't really store the key far enough away from the car because it was supposed to sense the key within a certain distance (can't remember how far). Just wanted to chime in and maybe this is a similar issue with the Viper?