Introduction

I purchased the Surya B22 Emergency LED bulb back in 2021 to handle frequent power outages. Since I didn’t have a home UPS or inverter at the time, this “plug-and-play” rechargeable bulb was a perfect, affordable solution for keeping the lights on.

However, after a few years of service, the bulb started malfunctioning. Instead of steady light, it began blinking incessantly. Curious about the failure, I decided to take it apart to find the root cause.

How to Disassemble a Surya Rechargeable LED Bulb

  1. Remove the Diffuser: The plastic dome at the top can usually be pried off with a flat-head tool.
  2. Expose the LED Plate: Inside, you’ll find the aluminum PCB housing 34 high-brightness LEDs.
  3. Access the Base: I pried the bottom plug (B22 connector) to release the internal assembly.

Why is my Surya Emergency Bulb Blinking?

Blinking in rechargeable LED bulbs usually indicates a failure in the power delivery cycle, either the LED driver circuit is failing, or the Lithium-ion battery can no longer hold a stable charge or take a charge.

LED Top view without the diffuser

You can see that the bulb has 34 LEDs inside.

I moved the bottom half of the bulb and managed to twist it out, exposing the circuit board inside and a removable battery.

18650 Li-ion battery

The Li-ion battery is made by Enerzone India. Rated at 3.7volts x 2600 mAh.

LED Driver Circuit

Inside the Surya Emergency Bulb: Components & Discovery

Upon twisting out the internal assembly, I found a surprisingly modular setup. The heart of the bulb consists of a control circuit and a removable battery.

  1. The Battery (The Likely Culprit) The unit uses a standard 18650 Li-ion battery made by Enerzone India. Specs: 3.7V | 2600 mAh.

Observation: I noticed black soot near the battery protection circuit. It appears a capacitor or a component on the protection board has >blown. While the battery cells might have some residual voltage, the protection board’s failure means it can no longer accept a charge or discharge safely.

  1. The LED Driver Circuit The circuit is relatively simple. One side handles the AC-to-DC conversion and charging, while the other side contains the logic chips to switch between “Mains” mode and “Battery” mode during a power cut.

Technical Note: The failure mode here is the internal safety board of the battery. When these protection circuits fail (often with a “boom” or soot mark), the driver circuit gets confused, leading to the “strobe” or blinking effect you see.

Conclusion: Is it Fixable?

My teardown suggests that the LED chips themselves are fine; the issue lies entirely with the 18650 battery pack. Because the battery is removable and uses a standard 3.7V rating, this is seems to be repair friendly.

My Next Step: I will try replacing the 18650 battery with a fresh one and check if the blinking stops. I’ll report back with the results!

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