Most auto parts stores have a tester specifically intended for that purpose.
Yes. How old is the battery ? . Is it the correct battery for your car/truck Are the battery terminal connections loose or corroded ? Clean ,tighten Get the battery checked at a local garage ( load test )
The average car battery life is 5 years. If a person does not drive their car much, the battery could actually last even longer. Some people claim to have batteries over 7 years old in their car, and the battery test excellent.
Then replace it.
Yes. That's what car battery chargers are for.
touch the wires to the battery terminal
Put the red test lead on the positive and the black test lead on the negative post of the battery and see the result.
In my experience this usually does mean that the alternator is not sending the battery enough charge. Many auto parts stores will bench test your alternator for free, some can even test it while it is still on your car. I recommend getting it tested. They can also test your battery; you would be surprised how fast a battery can go bad. Sometimes you can get a battery that is just a lemon. I hope this is helpful.
A car battery warranty can be bought at the place you got your battery from. Plus you can also bring in old battery for core money.
Disconnect negative cable first from old battery and connect it last when installing new battery.
You would make a car battery comparison by comparing which car battery seems better. You shouldn't keep the old car battery near because you can get it mixed up with the newer ones.
Aplly battery voltage to it, it should jump, engage.
Take the car or even just the battery to your local auto parts store. They can test it and tell you what you need for zip as long as you purchase the parts to repair it from them.