I picked up some LiHV (Reedy Zapper 4s 5200s) and used them for the first time this weekend. I charged at 1c and noticed the IR was typically in the 2-3mΩ during the charge process and 1.xmΩ after the run. I'd like to keep the batteries in good condition for as long as possible and noticed that some people recommended charging them at much higher rates (40a) and discharging them at higher rates as well (my iCharger X6 only discharges at 2a). I have no use for the performance advantage this offers after a five year layoff from racing but I'd like to keep the batteries working to their potential for as long as possible (Reedy recommended max charge rates of 2c (10.4a) so it doesn't look like I can take advantage of that anyways).

What is a normal mΩ range for the batteries to be?
Is there a specific mΩ range I should look at replacing them?