How do I know if car battery needs to be replaced or just needs to charge up?

The short answer is get it tested. Autozone will test your battery for you for free. The issue with batteries is that they can lose there "reserve" power over time (due to the accumulation of sulfate crystals).

The time it takes to recharge the battery varies depending on the size and reserve amp ratings. I'v had success with 15 to 30 minutes.

If your car doesn't start then that would say that you need a new battery. You can get the battery test if it needs recharged. Batteries last about 2 years if not more.My dad had the original battery last 7 years in his 2000 Saturn ls no joke.

Plus a car needs 12volts(I think that's right) to start cause once the car is started the car will run off the alternator. Your lucky if your car will start with less than 12volts.

Battery life is two -two and half years, or can expire if no battery water for long time. Battery can be cecked by using a wire test. At the out lets.

Battery test with a wire can be done, observations open all the caps and look into it for bubbles if bubbles emerge in any cell battery is dead. Thanks take care.

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