About Vdiagtool "BT300 ". VDIAGTOOL BT300 Battery Load Tester: Your Ultimate Guardian for Battery Health. The VDIAGTOOL BT300 Car Battery Tester redefines versatility. Designed to handle 6V~12V batteries (including 12V battery testers for cars, motorcycles, boats, and RVs), this advanced tool effortlessly supports capacities from 5 to 3000 CCA.
