Ultrabright LED Emergency Lamp (Rechargeable)

By on November 13, 2013


Preparing for a calamity or go camping? Make an ultrabright emergency light in just minutes! Best part is: it glows a 360° and completely WATERPROOF!. In addition the jar’s lid can be detached from the jar turning it into a compact flashlight! This is a simple project that uses a 3W LED and a BL-5C (Li-ion) Nokia battery. Macgyver Style! It’s completely rechargeable, via USB or wall outliet (5v), only takes an hour to fully charge the lamp. The goal is to make this project as simple as you can.

Step 1: Gathering Tools & Materials


Since this was a “Macgyver” type of assembly, the parts needed to come from recycled parts. Most of them came from my scrap radio on the other hand my 3W LED came from an old 220v LED Bulb.

– 3W Ultrabright LED       (Radioshack or AC LED Bulbs)
– Red LED Indicator        (Recycled Parts)
– BL-5C Nokia Battery     (Old Nokia Phone)
– 1N4007 Recitifer Diode  (Recycled Parts)
– 470 ohm Resistor         (Radioshack or Recycled Parts)
– On/ Off switch              (Recycled Parts)
– DC Power Jack            (Recycled Parts)
– Scotch Mounting Strips

Tools & Equipment:
– Soldering Iron
– Hot Glue Gun
– Leatherman 
– Portable Drill

Step 2: Hot Glue The Parts In Place


1st.)  Drill two holes (6mm) for your “Charger’s Plug” and for the “Slider Switch”
2nd.) Solder two wires to your BL-5C’s positive and negative terminals.
3rd.)  Hot glue everything In place!
4th.)  Use a small strip of Scotch’s mounting pads to mount the 3W LED (BTW, they don’t melt)

Want To Make It Waterproof?
Don’t drill holes, just hot glue the socket and switch inside the jar/ lid. Just unscrew the lid to charge!

Step 3: Optional: Adding a USB Lithium USB Charger


When you charge your lamp, trickle charging isn’t the best way to charge lithium batteries. When overcharged, they have the tendency to explode. If you plan to use this in long terms, it’s ideal to attach this module for safety.

Step 4: The Schematic Diagram


One thing you must know BL-5C batteries, they have a voltage protection circuit inside them. You can trickle charge these batteries at 5 volts, just limit the charge time for an hour. If you want to take precaution, there are Lithium battery chargers available out there.

How Does The Circuit Work?
This is a very simple circuit that doesn’t require circuit boards. All it does is trickle charge the battery, a rectifier diode was added to prevent the backflow of current. I added a LED charging indicator just to show whether the jar is charging or not.

Step 5: Solder Everything In Place


Just follow the circuit diagram and you are good to go! A perf board isn’t necessary but if you insist then go ahead.

Step 6: Charge Testing


Cool! If you’ve done it right, the jar should glow red when the charging. 

Step 7: You’re Done!


Lets Go Camping



About The Survivalist

Total bacon buff. Explorer. Survivalist Expert. Zombie Fanatic/Hunter. Internet Entrepreneur

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