DIY 3.7V Battery Level Indicator Using LEDs #electronic #electronics #diy #ideax

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🔋 3.7V Battery Level Indicator Circuit using LEDs and Resistors 💡

Want to visually monitor your 3.7V lithium-ion battery charge level in real time? In this DIY video, we’ll show you how to make a simple and effective battery level indicator using just LEDs and resistors — no ICs or microcontrollers needed!

This circuit is ideal for 18650 Li-ion batteries used in portable electronics, flashlights, DIY power banks, and solar kits.

🔍 What You'll Learn:
✔️ How to design a 3.7V battery level indicator
✔️ How to assign different voltage thresholds to LED indicators
✔️ Best resistor values for 25%, 50%, 75%, and 100% levels
✔️ Simple battery monitoring solution without complexity

🧩 Components Used:
4x LEDs (Red, Orange, Yellow, Green) – For 25%, 50%, 75%, and 100% charge levels

4x Voltage Divider Resistors – Configured for different voltage thresholds

3.7V Lithium-Ion Battery (18650 or equivalent)

Basic wiring – No ICs, No Arduino

📌 Perfect For:

✅ Power bank battery indicators
✅ Solar charger monitoring
✅ 18650 DIY projects
✅ Beginner electronics learning

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