This Dandy Gadget: Based on Sonata technology, this new HP battery offers you sustainable performance for three years, three times longer than others, and supports 18 existing notebook models representing approximately 70 percent of HP’s consumer notebook PC portfolio. Including the model in HP Pavilion, HP HDX, Compaq Presario and HP G series.
HP Enviro Series notebook battery is available as an accessory priced at $149.99. Instead, HP is providing a three years warranty on the battery. [Dandy Gadget Source]