That is pure, plain baloney! The RT doesn't come with a Battery Tender because it doesn't require a battery tender for normal use. Your usage is minimal, but certainly within the realm of normal. The battery should hold a charge for a month or more in warm weather. The tech needs to remove or disconnect your battery, then charge it. If the disconnected battery holds a charge until morning, and passes a load test, then you have a short somewhere. These can be hard to track down...and a new wiring harness may be in order. If the battery doesn't hold or pass a load test, it needs to be repalced. If your technician is not capable of dealing with this, perhaps you need to visit another dealer. I hope Carlo contacts you, or you contact him. I'm sure this can be resolved.