I watched a youtube video today telling about new forms of batteries- Nuclear Diamond Batteries. The battery is believed to work for over thousands of years!
Read about it more on wikipedia, or watch the video on youtube.
Nuclear Diamond Batteries– The future of batteries
gives new life to old computers 
Re: Nuclear Diamond Batteries– The future of batteries
Perhaps.
But don't hold your breath.
Consider the cost of diamonds !
The Australian State Governments have all enacted laws to steal your assets on your death. All legal paperwork is binned and all assets seized on one disgruntled child's complaint.Move them well before you die or go into a home.
Re: Nuclear Diamond Batteries– The future of batteries
Those researchers propose that this 14C gas could be collected and used to produce man-made diamonds by a process known as chemical vapor deposition using low pressure and elevated temperature, noting that this diamond would be a thin sheet and not of the stereotypical diamond cut. The resulting diamond made of radioactive 14C would still produce beta radiation which researchers claim would allow it to be used as a betavoltaic source. Researchers also claim this diamond would be sandwiched between non-radioactive man-made diamonds made from 12C which would block radiation from the source and would also be used for energy conversion as a diamond semiconductor instead of conventional silicon semiconductors.[11]
Not the kind of diamonds used in jewelry. Industrial diamonds already in widespread use, these are not "pretty" diamonds, but they are extremely hard substance and economical.