A few days ago, I asked whether investors should get charged upabout the IPO of lithium-ion battery maker A123 Systems (Nasdaq: AONE). Well, the market has spoken -- loudly.

On Thursday, the offering was boosted from 25 million to 27.5 million shares (plus 680,501 shares sold by existing stockholders), and priced at $13.50 per share. Investors piled on all day, pushing the share price up past $21 at one point.

So much for our preliminary share structure calculations. Based on the current price of $19.61, here's an update:

Share Structure and Capitalization

Numbers

Shares outstanding

98.2 million

Market capitalization

$1,925 million

Cash and equivalents

$457.7 million

Debt

$16.2 million

Enterprise value Continued...