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What I can't find anywhere is a statement as to the "Specific Energy Density" that the diamond battery can theoretically store / produce.
Synthetic industrial diamonds are cheaper than natural diamonds, but they are still quite expensive to produce (although the cost would reduce if production ramps up.) However, if you can only generate a few milliwatts (or microwatts?) per gram of diamond, it is hard to see how they would be a cost-effective energy source for most practical purposes.
Even if they can achieve a few hundred millwatts per gram (similar to current battery technology, for example), you would need several kilograms of diamonds per kilowatt. Imagine the costs of a diamond power pack required for a typical bike, car or house!
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