How can this be awarded! WTF.
We have common sized AA, AAA, C, D and 9V batteries that can be recharged. Same with Celphones.
"Serviceable cores"? isn't this like refilling batteries with hydrogen or water (for car batteries).
"alternate between charging the batteries (when plugged in) or using them" aren't we already doing this NOW. Even on Laptop of days gone.
All of this has been done before and its free to use. People of old are smart, they know that basic ideas can only get better if others can innovate around it without fear infringing any patents.
This is just another example of why the Patent system is not good for innovation. This system we call Patent increases the amount of time for us Humans to Go to other Planets. Because of fear that big APL, patent Trolls will start suing our asses for improving on a concept that they them selves cannot innovate anymore.