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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.
Often people will use two 6 Volt batteries wired in series to get to the 12 volts that they need. Good battery interconnect cables are an essential part of putting your battery bank together. Choosing the proper gauge wire is critical and the correct wire length deterimines the effeciency of your system. Cables that are to long will result in power loss and unnecessary resistance. We currently offer 1/0 AWG, 2/0 AWG and 4/0 AWG battery interconnect cables.