they are one millimeter wider then the 4000packs, the 3s 4k pack is a snug fit in my slash.. it just might be possible... might need some light dremel sanding though.
You will need a notch for the wires to come out through.
Benjamin White
R/c Monster Team Driver
Jq the car, LST, Sportweks turmoil pro
Unconventional Techniques, Superior Results