Your average Lipo pack is 250g-300g range and most NiMh batts are about 450g ish. My SP had about 100g lead strip under the lipo and a square of lead on top of the servo about 25g, both cut from roofing lead. This i did to get the car to jump half sensibly as without the weight it would flop over to one side in the air too easily. My own personal opinion also is that there is too much weight in the back of the SP chassis layout and that is the reason for the lead on the servo. HTH
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