Why does a newly replaced battery not last long?

[SanLila]

Newly replaced battery not lasting long can be attributed to the following reasons: Battery quality issues: When replacing the battery, it is essential not to opt for cheap options but to choose reliable manufacturers. Charger malfunction: If you suspect the charger has an undercharging issue, you can first charge it until the indicator light changes, then continue charging with a normal charger. If charging can proceed, it can be confirmed that there is an undercharging fault. Motor aging: High power consumption in electric vehicles due to aging motors, poor controller compatibility, or excessive running resistance is also a major reason for the short range. Replacing the aging parts can resolve the issue.

[HarleyLee]

Last time I replaced my car battery with a new one, but it wouldn't start after just a few days, which was quite puzzling. After checking for a long time, I found out the battery might have been a refurbished one with aged electrode plates and insufficient capacity - nothing like a new battery at all. Ordinary car owners need to keep their eyes open when buying batteries, choose reputable brand stores, and don't go for cheap options. Also, it's best to have the seller test the battery's charge before installation to avoid problems. If a new battery has been in factory storage for too long, sulfation can cause high internal resistance, leaving it dead after one night. Regularly check the fluid level and top up with distilled water in time, while avoiding parking in overheated environments. In short, if a new battery doesn't last long, it's not necessarily the car's fault - more likely it's poor battery quality. Spending a bit more on a good brand can save you a lot of trouble.

[SanHector]

As a hands-on car repair enthusiast, I've pondered the issue of new batteries not lasting long. It's likely due to an inadequate charging system, such as a faulty alternator or a loose belt, resulting in insufficient output voltage and the battery not being fully charged. A simple test method: start the engine and measure the battery voltage with a multimeter; it should normally be between 13.5 and 14.5 volts. If it's lower, check the alternator or voltage regulator. Additionally, after installing a new car battery, it's best to take a long drive to fully charge it, rather than just making short trips. If the battery terminals are dirty, it can also lead to poor contact and rapid power loss, so clean them thoroughly and secure them properly. Always keep an eye on the dashboard's charging indicator light—don't drive if it's on. Remember these tips to avoid the hassle of frequently replacing new batteries.

[BrookeLee]

I found that the newly replaced battery doesn't last long, often due to something in the car draining power. For example, the trunk light is stuck and not turned off, or the anti-theft system malfunctions, causing continuous battery discharge. Use an ammeter to measure the sleep current—if it exceeds 50mA, it indicates severe leakage. New car batteries need a few weeks of adaptation, but common issues arise from parasitic drain. Check if all light switches are properly turned off, especially for aftermarket electronic devices. Low ambient temperatures also affect battery performance; parking in a garage during winter can help. After replacing the battery, it's recommended to perform a full vehicle electrical diagnosis to identify hidden power drains.