Originally Posted by
malkiy
From my experience, SMC has better IR than packs costing $30-$40 more. I've had fantom, trinity, mcclan, protek, intellect, sunpadow, LRP and R1.
For batteries it is easy to get good IR and voltage drop from non-ulcg batteries. You see the quality of the brand when they can get good IR and voltage drop from ulcg batteries (packs that weigh 255g or less). The SMC 6400 ulcg packs I recently bought both have 1.4 IR on a 20 charge / 20 discharge cycle. Other brands that have decent ulcg perfornace were LRP and Sunpadow. The worst packs I've had were R1, fantom and intellect (2.4 ir - 3ir new after 3 cycles).
IR only tells us a small portion of battery performance however. What happens to the Voltage Drop under a load tells much more of a reality on a packs performance. I have a couple of packs here that have wonderful IR numbers, but when I put a real life simulation (current draw) the voltage drop is higher than some other packs that have better IR numbers.
The difference is noted on the track as well ripping on our high bite straight