Electrical
    medium urgency
    car
    truck
    rv
    motorcycle

    Why Does My Battery Keep Dying?

    Typical repair cost: $0–$700

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    Common Symptoms

    Battery dead overnight
    Slow crank after short sit
    Dim lights at idle
    Battery light on dash
    Frequent jump starts

    Most Likely Causes

    1

    Old battery

    Most batteries last 3-5 years; load test reveals true capacity.

    2

    Bad alternator

    Charging voltage below 13.5V at idle or above 14.8V indicates failure.

    3

    Parasitic draw

    >50 mA after sleep means something stayed on; trunk, glove box, aftermarket gear.

    4

    Corroded terminals

    Surface resistance prevents proper charging.

    5

    Short trips

    Trips under 15 minutes don't recharge a battery fully — especially in cold weather.

    How a Shop Diagnoses It

    1. 1.Load test the battery (not just voltage).
    2. 2.Test alternator output at idle and 2,000 RPM with accessories on.
    3. 3.Parasitic draw test: pull amp meter in series after car sleeps.

    When to see a professional

    If it dies twice in a week with a known-good battery, get a parasitic-draw test — DIY-ing it can take hours.

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