You can run from 1 to 50 lights on a single 9 Volt battery
Here 3mm fast flashing was used to modify this entire car.
The lights in the car are all 3mm fast flashers
These flashing LEDs will work great with anywhere from 5-13 Volts of Power. In tests, three flashers can run brightly on a single 9V Duracell battery for 40 hours. Available are both fast flash LEDs for modern cars See a 1:18 car with lights, and also Standard flash LEDs for earlier era cars.
BELOW YOU CAN VIEW both Normal and Fast Flash Rates in this Video of 1:43 cars
These flashers look great and work great in many RC applications such as RC Helicopters, RC Airplanes, RC Trucks, and other RC Vehicles.
These flashing LEDs bring to life all Die Cast 1:18 Scale Police Cars and Fire Trucks, 1:24 Scale Cars and Trucks, and Die Cast 1:48 Scale Police Cars and Fire Trucks, as well as Maintenance Vehicles, Ambulances, Tow Trucks, and any other Emergency Vehicle and Helicopter and Airplane Lighting.
Fast Flash LEDs Fast flashing LEDs are great in modern era Diecast Police Cars, Fire Trucks, Ambulance, Tow Trucks and other types of emergency vehicles, or use them for fast Helicopter strobe lights.
Normal Flash LEDs This is a good choice for 1950's era die casts.