Depends on what is connected to the battery and the load that item is pulling.
When your lights are on and your engine is not running you are taking the power for your car lights directly from your battery. If you leave them on long enough, you will run down your battery and your car will not start. Then you will need a jump.
A battery charger does one thing. It charges a battery, and starts with whatever charge is in the battery and goes from there. Running an automobile battery down will shorten it's life.
A car will sit a while before a battery goes dead but the length of time is very dependent on the battery's condition and the weather. It can sit indefinitely if it is properly put away. Top up with oil, drain the gas tank and keep the car out of the weather. Check the battery regularly.
well if you do nothing the battery will stay full a long time . and if you leave the light`s on it will be empty the next morning[i speak whit experience] it has happend to me. but the car battery of my car has not been replaced for 190.000 km[117.800miles]
After jump starting a car, the battery should run for at least five minutes. You want to get enough juice in the battery before attempting to turn it off.
Hard to say as it depends on the battery and how good it is. A good battery can sit for 6 months and easily still start a car and 1 year is not out of the question.
As long as the battery is functional you can continue to jump it. However, know that every time you run a car battery down you shorten its life. A battery that is designed to be run completely down and then recharged is called a deep cycle battery. Automobile batteries are not deep cycle batteries. Discharging them completely causes damage to the battery itself.
depending on you battery usually between 2-4 hours if you leave your headlights on. My Car battery was completly dead after almost 4 when i wrote my exam.
When you say boat battery if you are referring to a Deep Cycle battery as used to power a trolling motor then no, it is not suitable for use in a car. However, if you are referring to a battery in a boat used to start the engine and it is not a Deep Cycle battery it will work just fine in a car as long as it fits the battery holder, can be strapped down, and the battery posts are orientated correctly.
having a flat battery should not damage a car however in newer cars you might have to get some things re-set like the imobiliser,ecu etc
MY XK8 WAS IN THE GARAGE FOR ABOUT 7 WEEKS AND THE BATTERY WOULD NOT START THE CAR BUT EVERYTHING ELSE CAME ON.
If a car sits for that long it is usually necessary to recharge the battery before you will be able to start it.