I just bought another XMOD (white supra) because my red supra was acting up, steering was flipping out. I just tried the new one to make sure it didn't have the same problem, and it doesn't, steering is flawless. Now I have a parts car

I was just wondering, since I plan on using one of the battery holders from my old car to make a 6-cell mod on my new one, but I only have 4 I-C3 batteries, what are the consequences of mixing battery types? I wanted to mix my Rayovac I-C3's with RS NIMH rechargables. Thanks guys