For racing, all my batteries are under 2 milliohms per cell (more like 1.2 or less depending on age). When you see really high IR numbers, it's often the connector isn't making good contact. I would check that first before tossing out batteries. Just split the bullet with an xacto knife and it should read properly again. Not saying this is the case for your batteries, but it happens to me every so often with loose charge cable bullets.