Gurps Spaceships: Rechargeable Fuel Cells

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Any ideas on how I could represent a tech setting that possessed advanced energy storage technology (energy banks, batteries, rechargeable fuel cells, etc.) and limited energy generation technology (reactors). For example, Blake's 7 (http://en.wikipedia.org/wiki/Blake's_7) had ships that ran off of massive energy banks that could be recharged by a reactor or solar panels. The Liberator (http://www.btinternet.com/~blakes.se...liberator.html) had seven energy banks.

These energy banks would work like fuel cells except that:

1. no "fuel" is involved,
2. they can be recharged by spare power points from reactors or solar panels.