From what i understand they are a re design IP cell.. They did very well with htem at the touring nats.. There a better made cell as far as durability.. Ive also heard the run pretty good.. Only time will tell..
I'll be running the Hefty EP4200 cells at the BRL race. I heard that there isn't much difference between these and what people had for the Snowbirds. They are new cells, but there probably a heck of a lot better than any old cells. I still have 2 of the packs that Hefty put out at the Ft. Wayne BRL race and they ran really well this past weekend. I'm looking forward to trying the EP's.
Ran Pro-Match EP's this week-end in Daytona. Car and Driver stunk up the show. Wasn't the Batteries fault. Batts were strong, Performed well on the track. No venting or other issues while charging.Had plenty of "punch". Ran them in 4-cell stock.