Copper cable lugs aren't the best choice for direct use with aluminium cables because of the risk of galvanic corrosion. When copper and aluminium come into contact, especially in moist conditions, a chemical reaction called galvanic corrosion can take place. This can weaken the connection over time, leading to increased resistance, overheating, and even electrical failures or fire ri... https://www.pioneerpowers.com/copper-cable-lugs.php