wiring and electical help

[eli_eli]

ok, so i have a question...i hooked up some electrical fans on my car, i ran them off of a relay, brand unknown...i am not sure what they are runing off of, but definetly not straight from the battery, now i saw the same fans runing on a different car, and they are blowing a lot more air, basically i am trying to figure out why this is, could it be the relay? or is my battery not strong enough, i have a slim battery, not sure of the brand but i can check tomorow if you guys think it is the case...is it my relay? or maybe do i need to run the relay straight from the battery? i am sorry if it sounds a bit confusing, i am not very good at this wiring stuff, but just trying to diagnose the problem before buying more stuff...thx in advance, btw the fans are brand new, so i dont think they are the problem, i heard that if the relay is running off the water pump for example, it might not be getting enough power, but not sure that is the case