I got my Battery Manager a few weeks ago and ran my packs through a few cycles to see if the BatMan made a difference. My results were not very positive. I charged 14 packs completely which charged to an average of 4000mah. I ran two cycles for each pack. These were the discharge numbers: The average runtimes were around 370...avg volts 7.60, energy avg 82, capacity 3300. The interesting number was IR. the first cycle had IR's in the 30's and 40's. I expected the second cycle to be lower, but they actually went to the 40's and 50's. I cycled a brand new EA pack with only one run on it that registered a 59.5 IR. I wouldn't have been too concerned by the numbers except I took 8 of the packs to the track last weekend to test and each performed poorly. My cars lacked punch and topend. These packs had performed well previously. I'll do more testing, but I was curious to hear from other people about their experiences