The firecracker is a top notch cell, i've had mine through it's paces now for near 3 months and they still perform like they did on their first run. For the price and what you get it's simply amazing, great cells matched, built to a configuration of your chosing and posted for just over £30 ALL IN THE UK!!
They look and feel smaller than the IB's i've not got a set of calipers so i can't give an accurate reading im afraid. Defiantly lighter though.
The East Power cell will by my choice for 2007
Back on subject though - Voodoo cells
If any more cell questioning is needed, please some one make a thread in the electric section.