New Battery TeQ, page-2

The new Lithium/carbon dioxide battery as been mentioned on the forum at least once.

Here is the paper https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201902518 the full PDF can be found at the bottom in "supporting information"

This paper is a bit beyond me so if I misrepresent or get anything wrong please feel free to correct me.

They never seem to mention the 500 charge/discharge cycles and instead say.

"Supplementary Figure S10 shows the resistance of cathode material for Pristine, 10th charge and discharge cycle. As can be seen, the cell, in charged state, shows the same behavior to pristine condition after 10 consecutive cycles. These results are consistent with other characterizations confirming the reversibility of products formation and decomposition."

To me it seems they completed ten cycles and extrapolated the data.