is there any information on how many times the mini 3 pro battery lasts from empty to full and if it is charged 80 times, are the batteries starting to run out

From what I have seen, the Mini 3 Pro batteries can definetley last over 80 charge cycles without much issue if you store them properly, of course they will lose their ability to hold as much charge but I do believe you could use the batteries for a few years before they will eventually need to be replaced. But this is considering if you buy the official Mini 3 Pro batteries directly from DJI as 3rd party batteries may not last as long due to their lower quality.