A choke on a lawnmower engine, or any engine with a carburetor, is a device that reduces the airflow through the carburetor. It causes the fuel-air ratio to be richer, that is, more fuel and less air. This helps most carbureted engines to start while cold and before steady fuel flow is established, but the rich mixture reduces the power and efficiency of the engine tremendously. Leaving the choke on will produce hydrocarbon and carbon monoxide emissions and may cause the engine to stall as soon as any load is placed upon it. That is why engines require either manual release of the choke or have an automated device to back it off. Excessive use of the choke will generally result in fouled spark plugs.
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You need to take you car to a mechanic. It is obvious you do not know what you are doing. Your battery is in the electrical system. Your choke is in the fuel system. They are separate. It is normal to pull out your choke to start your engine. It is not normal to have your choke out to run your engine. As soon as your engine starts, you should push your choke in. When you pull out your choke, you close the air going into your carb. Then you push in the choke to allow air to flow through your carb. That lets you speed up or slow down. If it won't run with the choke pushed in, try pushing the choke in slower.
Weak battery, or starter going bad.
Soldiers from the American Navy got bored and put a lawnmower engine to a kart.
This engine is fuel injected and does not have an old style choke. Take it to a shop and have them look at it. Not a job for a novice.
I Would say the choke on your one barrel carburetor is sticking Start the engine. Let the engine reach operating temperature.Remove your Air cleaner to your Carburetor while the engine is running.Look down the throat of the carburetor and you will see a round flap A.K.A the butterfly.This flap should be completely open when the engine is at operating temperature open so that the air can pass through the throat of the carburetor freely. If you don't understand how a choke works go to howstuffworks and ask how a carburetor choke works and it will all make since.