Hi, I know the famous "charging system test" all too well unfortunately, so I also know it has do be done with a fully charged battery. My question is - in case I don't have a charged DRZ battery, or I suspect it's dead, can I perform those tests with a random 12V car battery? Can I do it with the car battery connected through jump start cables (with the DRZ battery disconnected of course). Should I expect different results? And for the reason I'm performing those tests - My bike stood at the dealer's for 6 months. They've charged it a few times, don't know when and how. When I took it back it was charged and ran fine for 4 days, and suddenly today the battery is completely flat, even the speedometer screen is off. starts fine with cables, as is said charging need to be tested. Could this be a dead battery, that for some reason held up for four days? Thanks!