I can see that they are emphasizing on the #DiamondBattery hashtag so that general public will be hooked and share it more, but why haven't they given any hints (mildly technical) to the capabilities of the battery?

// A team of physicists and chemists from the University of Bristol have grown a man-made diamond that, when placed in a radioactive field, is able to generate a small electrical current.//

When I read the "small electrical current", the physicist in me was naturally assuming a very small current of the order of pico to nano amperes (without being conservative) - essentially useless. Metrics like the half life of the battery doesn't make any sense at all if the power or current rating is not specified. Current rating is something you could trust, that it will end up as a viable product.

This would appeal more if they can give a direct link to their research paper.