Apple iPhone 6s vs. iPhone 6s Plus vs. Samsung Galaxy S6 vs. Galaxy S6 Edge: Which Flagship Smartphone Comes With Best Battery Life? We tested how the batteries of the Apple and Samsung flagships - the iPhone 6s, iPhone 6s Plus, Galaxy S6 and Galaxy S6 Edge - perform in the real world. Discover which of the four smartphones has the best battery life. by Anu Passary