You don't need 8000mah lipos, especially for the price maxamps charges for them... 5000mah will give you 20-25min of hard driving and you can buy 4 of the hobbycity 5000mah ones for the cost of 1 maxamps 8000mah. Since 8000mah would give you around 35-40 min of driving you can get twice the amount of driving with 4 x 5000mah compared to 1 x 8000mah.