The deal has been done for a while, but today's the first day that Boston-Power's much-vaunted Sonata batteries are actually available from HP, where they're now officially known as the HP Enviro Series batteries. Helping them earn that moniker is a promised "sustainable performance" for a full three years (which HP backs up with a warranty), and a number of other enviro-friendly measures that helped snag the batteries the Nordic Ecolabel certification. Best of all, the batteries are available for no less than 18 different HP laptops right from the get-go and, at $149.99, they don't demand quite the premium price that you might expect. You can't yet get them as an option in a new HP laptop, h