Other World Computing (OWC) and Newer Technology (NewerTech) have released what the companies say is highest capacity battery every made available for Apple’s PowerBook G4 15-inch Aluminum models.

The newest addition to the NewerTech NuPower Lithium-Ion battery family is rated at 55.5 watt hours providing almost 16 percent more run time capacity than Apple factory-shipped batteries, Larry O’Connor, CEO of OWC, says. The new batteries retail for US$139.99 and come with a one-year NewerTech warranty. A 53.3 Watt Hour model also is available for $129.99. These batteries are compatible with all of the PowerBook G4 Aluminum 15-inch models from 1.0GHz and up to the current 1.67GHz