Outdoor rsz_220820132677-762603

Published on September 2nd, 2013 | by Jules IKEAHacker


Camping Jansjo battery powered light


Materials: Jansjo lamp, Li-ion battery, socket, wire

Description: I want to share with you a simple “invention” I made to have a camping Jansjo.

At home I have three lamps JANSJO–. They are powered by a switching power supply. The cable lamp is connected to the 4Vdc power supply by an old type speaker connector (in Italy we call it “Punto-linea” connector).

Within the head, close to the LED chip, the current is adjusted with a special IC (I have opened one head, but I do not remember: I think there are two 340mA regulators in parallel for a total of 680mA) and a voltage of 3.4 V is enough to obtain the maximum intensity.




Having some Lithium cylindrical 3.7V nominal (3 ~ 4.2V according to the actual state of charge) 2.4 Ah cells salvaged from old laptops battery packs (I also use that cells for the flashlight, etc., and charge them with a specific Li-ion charger Soshine SC-S1 V3) I thought it might be suitable for JANSJO.

So I connected a small piece of red and black wire to female speaker connector and the other two ends to a
cell, holding them by a slice of bicycle inner tube. (anyone who repair bicycles has some of them to give). The night between the 14th and the 15th of August we had four hours of great lighting at about no cost in the gazebo at the beach!

Ah … I had also brought the gas lamp, but the light was ridiculous compared to a single JANSJO–! :-)

Have a good camping! :-)

~ Gianluca Giangreco, Roma, Italy


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The Author

Jules IKEAHacker

"I am Jules, the engine behind IKEAHackers and the one who keeps this site up and running. My mission is to capture all the wonderful, inspiring, clever hacks and ideas for our much loved IKEA items".

5 Responses to Camping Jansjo battery powered light

  1. Georgia says:

    If you need a handy camping light, you could also buy the Jansjö USB Led-light, and plug it in a Smartphone Portable Charger (USB-outlet).

  2. Arie says:

    You wrote you opened up one head of the Jansjo lamp. Is it possible to close it again neatly or will it get damaged and not close again?
    Could you describe how to do this?

    I also did some transformation of three Jansjo lights, but probably broke something, so I’d like to check the led inside the head.

  3. Gord says:

    Any ideas on converting the light to run off a 12V connection? ie an automotive battery.

  4. Anonymous says:

    Well done!

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