Viper 5900 2004 Chevy Tahoe

Ok i need some serious help, i recently got installed the Viper 5900 and a Kenwood In-dash Dvd. Ever since i got them both installed if i leave the car alone for a while and try to start it it will either be a lazy start like the battery is almost dead or it just wont start and i will need a jump to get my trcuk started. Has anyone got any ideas?

have you ever replaced the battery in your Tahoe?, it could just be the battery is finally giving out, I have an 04 Avalanche that I just replaced the battery in about 4 months ago

take it to sears get a electric dianostic its 10 bucks but very very good test