How to Care for Your Laptop''s Battery (So It Lasts Longer)
A chart on Battery University (third chart down the page) shows lithium-ion batteries kept in different temperatures for one year. A battery kept at a wintry 32 Fahrenheit (0 Celsius) retained 94 percent of its charge capacity, while a laptop at 104 F (40 C) held 65 percent. 86 F (30 C) is the benchmark Battery University recommends to stay under.