Two Letters Re: Betavoltaic Batteries

Here is an article describing the challenges associated with betavoltaic batteries. The recent buzz over the 30 year battery, while intriguing, is overly optimistic. As stated in the article I linked to, betavoltaics currently have low efficiency, require heavy shielding, and the energy absorption media tends to degrade due to the high energy bombardment. I think it would be great if they could overcome these issues, but it looks like it may be 30 years before we see anything like a 30 year battery. – Mark D. in Utah

Mr Rawles,
Firstly I would like to say that after recently having found your site, I now read it daily. Thank you for all your hard work. Hopefully I will be able to meet the 10 Cent Challenge in the next few weeks.
Regarding the 30 year battery and betavoltaics, there are many basic problems with such a battery design. I am not an expert in this field, however the article does make some amount of sense on a fundamental level. I wouldn’t hold your breath for a 30 year battery any time soon. Sincerely, – Derek from New York City (God help me)