B4 + Lipo = adding weight?

[Martijn]

Hi,

I drive a B4, with Nimh cells, but this year, we going to drive lipo's in our club.
So my question is; Where and how much weight do I put in my B4?

The minimum weight of the car needs to be 1474 grams, I think this is not enough because the car is to light?

Thanks,
Martijn.