I would disassmble the Nimh packs are resolder them side-by-side with good quality battery bars. You'll want to get some shoo-goo in-between the cells to strengthen them up for the bumps and jumps. Also if they are bare cells you'll want to get some individual cell shrink wrap before assembling so no shorts are caused.(the venom cells are all bare cells which come in those crappy carboard tubes)
I picked up the venom 5000Mah packs for my stock 3905, ripped them apart and reassembled them side-by-side with orion platinum battery bars and some deans 12g wire with the new traxxas connectors hangin' on the end. These batteries are running awesome for me about 20 min run times with good power.
The problem with pre-assmbled Nimh packs is that they use cheap thin batttery connectors that create alot of resistance and if you pump too much through them they fry up.
A little bit of time and effort makes even cheapy Nimh packs into something a bit better.
That's just my chime in tho..
