🔋 Reuse Old Laptop Batteries | 18650 Test with 12V Car Bulb & Multimeter (DIY Load Test)

Описание: 🔋 Reuse Old Laptop Batteries | 18650 Test with 12V Car Bulb & Multimeter (DIY Load Test)
Do you have old laptop batteries or 18650 lithium-ion cells lying around? Don’t throw them away! In this video, you’ll learn how to reuse and test 18650 batteries safely using a 12 V car headlight bulb and a digital multimeter — the easiest way to find good and bad cells in a 3-cell (≈12 V) pack.

⚙️ How to Test 18650 Batteries (Step-by-Step)

1️⃣ Charge each cell to 4.2 V using a proper charger (like TP4056).
2️⃣ Connect three 18650 cells in series (≈12.6 V).
3️⃣ Use a 12 V car headlight bulb as a load tester for around 1 minute.
4️⃣ Measure voltage of each cell with a digital multimeter.
5️⃣ The cell that drops fastest = ❌ Bad battery.

💡 Tip: A 5–10 W bulb gives a smoother, longer test. A 50–60 W headlight bulb drains faster and gets hot — use only for quick checks.

📏 Quick Voltage Guide
Condition Voltage After Load Status
3.6 – 3.9 V ✅ Good Ready to reuse
3.3 – 3.5 V ⚠️ Weak Limited use
Below 3V ❌ Bad Replace safely

🌱 Why Reuse 18650 Batteries?

✅ Save money
✅ Reduce e-waste
✅ Protect the environment
✅ Power Arduino, school projects & DIY electronics

⚠️ Safety Tips

⚡ Test on a non-flammable surface
⚡ Avoid swollen, rusted, or leaking cells
⚡ Never short-circuit or over-charge
⚡ Use proper Li-ion charging modules

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