FastMac today announced an iPod battery upgrade that utilizes what the company says is “patented nanoparticle technology to dramatically extend battery lifespan.” This upgrade is available for generation 1, 2, and 3 iPods and comes with a two-year warranty and a 30-day money back guaranty. Generation 1 and 2 batteries are priced at US$39.95 and generation 3 iPods cost $29.95. The company also notes that generation 4 iPod, iPod mini, and iPod photo upgrades are coming soon.