---
id: faq-0070
title: "How do I know if my battery needs replacement?"
category: faq
subtopic: service-and-maintenance
page_type: faq
source_url: "https://www.castlesubarumchenry.com"
tags: ["battery-service", "battery-replacement", "electrical-maintenance"]
questions:
  - "When should I replace my car battery?"
  - "What are signs my battery is dying?"
  - "How long do car batteries last?"
related: [winter-maintenance, electrical-checks, service-cost]
dealer: Castle Subaru McHenry
---

Most car batteries last 3-5 years, though extreme temperatures and driving habits affect lifespan. Watch for warning signs: slow engine cranking, dimmer headlights, clicking sounds when turning the key, or a battery warning light on your dashboard.

A dead battery leaves you stranded, so catching decline early saves hassle. A simple battery load test reveals if replacement is needed before you're stuck.

Castle Subaru McHenry's Service Department can test your battery for free and install a genuine Subaru replacement if needed. Especially before winter, a battery check is smart. Call (779) 601-0797 to schedule a battery test or replacement.