How to Test a New Battery That Doesn't Last Long?
3 Answers
No-load voltage refers to the voltage at the output end when the charger is connected to the power source but not connected to the battery. For example, a 36V charger has a no-load voltage of 41.55V. Load voltage refers to the voltage across the battery during normal charging, but the voltage value changes as the battery's current voltage rises until it reaches the constant voltage charging state.
Oh, if the new battery doesn't last long, I've encountered this several times myself. Don't rush to blame the battery first—it might just be a charging issue. New cars or new batteries left unused for long periods may have insufficient charge, so make sure to give them a full charge first. Use a voltmeter to check; after starting the vehicle, the voltage should be around 14 volts. If it's too low, it indicates a problem with the alternator. Also, check if the terminals are loose or corroded, as that can waste a lot of power. If the issue persists, there might be an internal short circuit or manufacturing defect, requiring a replacement. During regular use, minimize the use of high-power devices like air conditioning and lighting systems to extend battery life. In cold weather, batteries drain faster, so parking in a warmer spot helps. Remember, safety first—avoid touching exposed wires before handling anything yourself.
It's really frustrating when a new battery dies so quickly! I suggest starting with some basic checks to see if the car's charging system is working properly. After starting the engine, check the charging indicator on the dashboard - if the light is on, it means the alternator isn't functioning. Use a multimeter to measure the voltage across the battery terminals; normal range should be between 13 to 14 volts. Then try a load test by turning on the headlights and AC for a few minutes - if the voltage drops below 12 volts, there might be internal issues with the battery. Also, don't overlook potential wiring connection problems; loose or corroded terminals can cause power leakage. I once discovered a cracked wire insulation that caused a short circuit. When driving, try to avoid sudden acceleration and hard braking as they drain the battery faster. If you find any issues, take your car to a professional repair shop for proper diagnosis - don't delay as it could affect driving safety.
