Is my battery permanently degraded, and should I consider a new one?
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While driving back from the OBX to Hampton, VA last night, our 1500 Silverado's battery light started intermittently flashing. By the time I noticed it, the voltage was starting to fall from about 13 to 11, then as soon as it dropped to 9, the gauges completely cut out. I was able to stop and get a tow. This morning I replaced the alternator and charged the battery.
Unfortunately, the battery charger seems to only charge to 70%. The battery was installed only three months ago back in February.
Is it possible that this battery is permanently degraded by running the engine until the gauges/battery failed? Should I try leaving the battery charger on overnight to see if it can exceed the 70% threshold? The truck starts now and registers just slightly over 14V on the dashboard gauge.
I'm trying to determine if I should (or even can) return the battery since it is under warranty. I'm not a "car guy" here, so this is all new to me.
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May 23, 2025
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RepairPal Certified shops can diagnose and repair your 2002 Chevrolet Silverado 1500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hello, Dave here, contributing to RepairPal and providing expert advice since 2010.
Your concern sounds like a classic charging system concern - either a failed alternator or a detached drive belt.
Sounds like you resolved the problem;
The battery could have been stressed to the point that it will not reach a "full charge" any longer. Too hard to tell without a hands on "charge and retest" procedure. A slow charge can sometimes be successful in bringing an active and able battery back.
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