Cheap "lifetime" warranty brake pads are notorious for being squeaky. They are made so hard, which is how they can last so long, that they can easily be prone to squeaking.
Better/softer pads will likely reduce or eliminate the squeaking, not to mention softer pads will stop better. Pads like Savvy's Black Magic pads are probably the best pads going for absolute raw stopping power and they don't squeak in the least. I installed a set of them several months ago and they are pretty amazing. Savvy Offroad