Dang, if you watch the pbusardo videos for those devices they seem to actually have the same 2.5amp limit. Must be a 3.5 amp battery, but the board limits it to 2.5. Glad to see i'm not the only one interested in a higher power 14mm device though.
i want to say its all on how its setup (coil res, V, or W mode) - i own a mvp which is same board as the VV just a bigger batter cell.
for example, the board only allows for 11W in watts mode, but if you use a 1.8ohm coil and go to 5V, it surpases 11W and is actualy firing 13W at 2.8A.
real life experiance------------i have one tank that is 1ohm and when fired on the battery it came with which is a 3.5A cell, i watched how red the coil got. put it on an OLD genuine joyetech and watched, same glow. tried it on the mvp, same glow when set at 3.7V - if set at 11W it barely lit. put it on some noname ego from FT, and it barely turned red. --- just from that id have to beleive the VV board fires 3.5A. the VV and MVP are the same board.