Tesla’s new line of big, stackable batteries for homes and businesses started with a bang. The reservations reported in the first week are valued at roughly $800 million , according to numbers crunched by Bloomberg. If Tesla converts even a fraction of those reservations into actual sales, the battery roll-out could measure up as one of the biggest ever for a new product category. Photographer: Tim Rue/Bloomberg The chart below compares the estimated value of Tesla battery reservations—these are not ironclad commitments to buy—with the early sales of three breakthrough products: the original iPhone, released in 2007; Viagra’s debut in 1998; and the introduction of the Tesla Model S battery-powered car in 2012. The iPhone surpassed $1 billion in sales by its third quarter on the market, while Viagra and the Model S needed a bit longer.  The new line […]