booster battery time decrease???

[mcharles13]

Hey all i got the 350z booster kit 57mhz (put my supra body on it though) It runs very well and i get like 20-30 ft distance right out the box. I've done no mods to it yet, but i'm noticing my battery life seems to be getting less and less. Any idea what's up?
Possibly memory effect on the NiCad? (though i've been draining it completely b4 re-charge)

I did notice the boost button is significantly faster than a bit of the same specs. Non-boost my bit (with a 2.2 motor) is slower than a regular bit with 1.0 motor. Boost it is faster than a regular bit with 2.2 motor.