here's the 20Q listing: http://www.fasttech.com/products/1370404. They are INR and the 20R is the lowest resistance battery ever tested by HKJ here: https://budgetlightforum.com/t/-/17136. chart of resistances here: http://lygte-info.dk/review/batteries2012/Common18650Summary%20UK.html.
I don't think it will last 5 minutes near that kcd level - think I recorded the # about 10-15 secs into it, but continuously drops a little. I got a SinkPAD and a 18 gauge copper disc inside the pill, but it's not enough for sure. There's nothing to the crappy 501B host I'm using.