Second hand cells?

[muay30]

I havnt got much money at the moment and im after a 4cell batt for my 12th scale for indoor racing. Ive had some great offers but i asked at my racing club last night and someone said becarful buying second hand ones as they will have probably been ran into the ground. Can anybody recommend what to do? Or any cheapist battery cells to buy just to get me started? Many thanks. Ps sorry for all the questions im a total newbie