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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.
The second longer lead is for discharging or the power source for your airplane. The longer lead may. also be supplier with a JST connector or you may need to solder a connector onto the 16-gauge wire before use. WARNING: Please read before charging or using battery. IMPORTANT SAFETY INSTRUCTIONS AND WARNINGS.