[naturecured]

i opened my zip and saw it had a Ni-MH battery at 100 mAh

inside my clone bit was a Ni-CD battery at 60 mAh.
i swapped the batteries in the zip and saw it performed at basically the same rate.....which leads me to my next question:

are certain zips simply faster/better than other zips? i ask because no matter how i swap parts on my 2 zips my 49 is faster than my 27. A friend has absolutely no problem with either of his so i wanted to throw out the question to see if anyone else has had any similar experiences. i can assume just bad worksmanship on a cheap toy if that seems to be it and get another 27 ready to race other wise.