Revell classic 1950s German Trucks- Battery question ?

Hi Wirraway ;

 In answer to your Question . Many were under the seat and a whole lot were in a box just under the floor on the drivers side , available through a flat sheet metal panel under the door ! Others were in weather resistant boxes behind the cab .

I was wondering if anyone has experience of where the battery would go.  Not included in the kit so I will have to scratch one.  I have been detailing the engine a bit with fuel and coolant lines and electrical leads.  Not sure if the battery would go:

A.  In the engine bay ? (not a lot of room)

B.  On the Firewall (this seems most logical)

C.  Inside the cabin ? (under a seat)

D.  Somewhere behind the cab on the frame maybe ?

I'm sure someone who builds a lot of trucks will have the answer.