Other World Computing (OWC) and Newer Technology today introduced what they say is the highest capacity battery every made available for Apple’s PowerBook G4 15-inch Aluminum models. “Engineered with revolutionary cells just released on the market and not available through any other manufacturer in units of this capacity and quality, the newest addition to the NewerTech NuPower Lithium-Ion battery family are rated at 55.5 watt hours providing almost 16% more run time capacity than Apple factory-shipped batteries.” The new 55.5 Watt Hour PowerBook G4 Aluminum 15-inch batteries sell for US$139.99 and come with a one-year NewerTech warranty. A 53.3 Watt Hour model also is available for $129.99.