No problem, as long as electronics not damaged you can re-condition the car.
About battery, try to replace the oxideized connection bar, perhaps battrey can still work.
Trust me, I stopped playing for more than 15 years, I dig out all old staff and still run OK.
Even old Ni-CD, can use and not bad at all !
(For fun only, racing with bros no la...you need new stuff for racing !)