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Battery Keeps Dying: Why and How to Fix It

A battery that keeps dying usually points to one of three things: the battery is at end of life, the alternator isn't charging, or something is drawing power while the car is off (parasitic drain).

Typical repair cost: $243–$550

Common Causes

Aged battery
Most batteries last 3–5 years. Past that, they fail to hold charge.
Bad alternator
Charging output below spec — battery drains during drive.
Parasitic drain
Glovebox light, trunk light, aftermarket radio, or failing module draws current with key off.
Corroded terminals
Poor connection prevents full charging.

How Mobile Mechanics Diagnose It

  1. Battery load test at the vehicle.
  2. Alternator output test — measure amperage and voltage under load.
  3. Parasitic draw test — inline ammeter on negative cable, pulling fuses to find the source.

Repair Options & Cost Ranges

Battery replacement
$180–$350
Mobile install with warranty.
Alternator replacement
$400–$800
When output is below spec.
Parasitic draw repair
$150–$500
Diagnostic time + repair of the source.

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FAQs

How long should a car battery last?

3–5 years for most batteries. Heat shortens life. Past 4 years, expect to replace it.

Can a mobile mechanic find a parasitic draw?

Yes — we run an inline ammeter and pull fuses systematically until the source is isolated.