Solicore, maker of flexible, rechargeable batteries, raises $5M in debt Solicore, the Lakeland, FL owner of the Flexion brand of batteries, has raised an additional $5 million in venture debt from BlueCrest Capital FInance, according to VentureWire. Flexion batteries are made from lithium polymer, an environmentally safe mix that also allows for a thickness of less than half a millimeter. That width, in turn, allows for a great deal of flexibility, so that the battery can be built into non-standard device configurations. The company has raised in excess of $40 million since its founding from investors including Braemer Energy Ventures, Draper Fisher Jurvetson, Firelake Capital, OPG and Rho. It last venture financing was in 2005.