How To Check Your Car Battery's Condition At Home Without Expensive Tools

A weak battery rarely causes a sudden breakdown. With a multimeter and a simple visual check, you can detect the problem before the starter fails while you're on the road.

1. Check voltage with the engine off: a healthy reading is 12.4–12.7 V; anything below 12 V usually indicates a need for replacement. 2. With the engine running, voltage should rise to 13.7–14.5 V; if it stays below 13 V, suspect the alternator rather than just the battery. 3. Clean terminals to remove corrosion or white deposits; dirty terminals can make starting difficult even if the battery is in good condition. 4. Is the car rarely used? Run the engine for 10–15 minutes; self-discharge can cause the battery charge to drop within 1–3 weeks. 5. Perform a 5–10 minute check every 1–2 months: visually inspect the casing and terminals, measure voltage (engine off and running), and listen to the sound of the starter.

------- Source: https://www.toyota.astra.co.id/corporate-information/news-promo/read/cara-cek-kondisi-aki-mobil-sendiri-di-rumah-tanpa-alat-mahal (