250
A tiny radioactive battery could keep your future phone running for 50 years
(www.techradar.com)
This is a most excellent place for technology news and articles.
Perfect. Then they'll sell the battery separately and it'll cost $5000
A battery that last several years and can be used in a plethora of devices would be reasonably expensive yes. $5000 is a lot but maybe $500 is more reasonable for something like that?