Typical repair cost: $0–$700
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Most batteries last 3-5 years; load test reveals true capacity.
Charging voltage below 13.5V at idle or above 14.8V indicates failure.
>50 mA after sleep means something stayed on; trunk, glove box, aftermarket gear.
Surface resistance prevents proper charging.
Trips under 15 minutes don't recharge a battery fully — especially in cold weather.
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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