Originally Posted by AxiomJacob
so is there any other useful information about 4600s
Sorry to change the subject back to the actual EP4600 batteries but I will...
So far they are definately better than the EP4200 they replace (yes replace) in both runtime and average voltage. IR is the same as the old EP4200 cells - after zapping IR is mostly between 1.5 and 1.7 with a small percentage going over that.
Runtime is averaging very close to 470 seconds at 35 amp discharge. That equals about 4570 Mahr capacity - not quite 4600 capacity but pretty close - ON AVERAGE. On either end of the runtime scale I have about 8% of the cells exceeding 480 seconds of runtime (about 4666+ Mahr capacity) and about 9% of the cells falling under 460 seconds runtime (about 4470 Mahr or less). Average voltage is a little better that the 4200 cells with most cells easily exceeding 1.230+ volts and maybe 10% to 15% actually hitting 1.240+ volts. Out of 200 cells graded so far none have vented while charging at 6 amps and these were all cycled 2 times. I had one cell drop to 0 volts after a cycle and not recover on it's own - it is considered defective now of course. Out of the first 200 cells I have 26 cells in the "dud" pile - Cells that would not make 450+ seconds of runtime or that were not 1.230 volts or better plus the one cell that went to 0 volts. That is not so bad actually. These will make good stick packs plus a few paper weights.
All cells were zapped before doing anything else. First cycle was generally a little weak with the cells improving significantly on the second cycle. I tried cycling a small batch of cells 3 times and there was small but noticeable improvement in overall cell performance but it is not really worth the time to cycle several hundred cells 3 times.
Overall I will say I am happy with the cells although I believe they should have been labeled as 4500 Mah cells instead of 4600 Mah based upon what I have seen so far. I believe the cells will prove to be reliable as were the previous 4200 cells. Don't expect to see consistent 1.240+ volt cells though like the IB cells advertise - (I have to trust the labels I have seen as I haven't matched those personally).
I hope this is useful info to those hoping to find it. I have no bias and pride myself on being honest. I am selling these cells but will not lie and give them a glowing report they don't deserve in the hopes somebody will buy a pack from me instead of somebody else.
Oh, I've been out of town over the past weekend so didn't have a chance to race these yet but I expect them to perform well but doubt my limited driving skills will tell a difference between these and other cells with regard to punch or top speed.