What size LiPO can I use with my Xiao

Hi I am curious to know what size LiPO that I might use (while connected to the 2-pin JST connector). I understand that the circuitry only supports a charging current of about 500 mA. I don’t see anything wrong with using a larger LiPO than about 500 mAh.

Also I assume that the charger circuitry is only suitable for use with LiPO cells, and NOT LiFePO4 cells.

Thanks for all of the help!