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Battery maker lands a powerful $13.2 million in funding.

This story appears in the March 2010 issue of Entrepreneur. Subscribe »

In a world where electronics and gadgets are getting smaller and more sophisticated, the batteries that power them need to shrink as well. That's opened up a big market for Solicore , a Lakeland, Fla.,-based developer, manufacturer and supplier of ultrathin, flexible lithium polymer batteries under the Flexion brand. These skinny power sources can be used for everything from RFID tags to micro medical devices. However, the sweet spot the company has found are "smart" credit cards, such as Bank of America's SafePass, which generates single-use passwords to protect against fraud.

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