Should I Replace My Car Battery If It's Dead?

3 Answers
VeraFitz
07/28/25 5:11pm
If the battery is not damaged, replacement is unnecessary. Below are methods to check if the battery is faulty: 1. Check the battery voltage. A normal battery voltage is 12V. After starting the generator, the voltage should rise to 13-14V. If the voltage is below 12V when the vehicle is off or below 13V after starting, the battery may have issues. 2. Check the battery's usage time. Currently, the most commonly used car batteries are lead-acid maintenance-free batteries, with a lifespan of around 2 years. With proper maintenance, they can last 3-4 years. Start-stop vehicle-specific batteries have a lifespan of 4-6 years. If the battery exceeds these timeframes, replacement should be considered. 3. Use a car emergency jump starter to power the vehicle. After starting, let the engine run for 30 minutes, typically maintaining around 1500 RPM. Charging for 30 minutes and leaving it overnight should allow the car to start the next day, indicating the battery is still functional. Most car insurance policies now include 2 free roadside assistance services, so you can simply call for help.
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XavierLynn
08/11/25 9:20pm
I've encountered this issue several times. A dead car battery doesn't necessarily require immediate replacement - you should first identify the cause. If the battery is new, it might just be due to leaving lights or AC on which drained it. In this case, you can ask a friend for a jump start and recharge by normal driving. However, if the battery is over 3-4 years old and frequently loses charge, or tests below 12.4 volts, it indicates severe aging and should be replaced promptly. I recommend first checking voltage with a multimeter: when turned off, a healthy battery should read above 12.6 volts, while below 12.2 volts means it's basically dead. Also inspect the charging system - the alternator output should be between 13-14.5 volts, as higher voltage can damage the battery. Don't try to save money here - a new battery only costs a few hundred bucks, which beats the greater risk of being stranded on the road.
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StJocelyn
09/29/25 8:22am
As someone who drives daily, a dead battery is really annoying. Last time my car wouldn't start, I jump-started it and drove to the shop for inspection. The mechanic said the battery was swollen and replaced it with a new one. Generally speaking, a battery's lifespan is 3 to 5 years. Overused batteries tend to have increased internal resistance and can't hold a charge. Don't just keep charging it as a temporary fix - if you experience difficulty starting the engine or hear rough cranking sounds, it means the battery is failing. I recommend trying to charge it at least once and observing the starting performance and runtime. If it keeps dying repeatedly, replace it immediately. Nowadays you can get mainstream brand batteries for 200-300 RMB. Safety comes first - don't underestimate this issue as it could leave you stranded on the road and affect traffic.
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