You are exiting the NIH SBIR/STTR website and entering a non-federal website. External links provide additional information that is consistent with the intended purpose of this site. The NIH SBIR/STTR program cannot attest to the accuracy of information provided by these links.
When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
Photo 2: Hook-up at the good battery. Connect to the positive cable to the positive terminal and the negative cable to the negative terminal of the good battery. Clamp the positive (red or yellow) cable to the positive terminal of the weak battery.