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Our team did this last year with some of the 12V rechargable (lead-acid) batteries...
Unfortunately I don't have the circuit schematic for it.
It shouldn't be that difficult though. It's just a simple voltage and current divider. Ratshack should sell connectors needed to plug into the OI's wall transformer input. The transformer brick should say what you need to output.
Ours was a little more complex. It had leds that dimmed as the voltage dropped from 13.5V to 8V. The transformer I believe puts out 7 or 7.5V... I could be wrong though.
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