Question about Jabra BT350 Bluetooth Headset Headset

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How do I replace battery? - Jabra BT350 Bluetooth Headset Headset

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  • RajMengi Dec 29, 2008

    Would also like to know how to replace the battery and the battery specs. I didnt use the headset for a couple of years and the battery died in the meantime.

  • RajMengi May 11, 2010

    Found some info at this URL about opening it up, but not sure if its safe for novices



    http://www.instructables.com/id/Jabra-BT...

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I had the same problem... the battery is part # 501235 and is 3.7v 150 mah (yes, it's tiny). Searching for this on the web yields such a part at various places but not any retail options that I could find.
I took it apart per the instructions at instructables.com (above) and then jump-started the battery using a maglight penlight. Sometimes rechargeable batteries get "stuck" on empty when they drain down to absolute zero and have trouble accepting any charge... To jumpstart it, do this:
Get a Maglight AAA or AA penlight (2 cell) and unscrew the end as if you were going to replace the light bulb. The bare bulb must be on when the reflector is removed (or, perhaps the batteries are dead).
Remove the bulb.
Obtain two short (1") pieces of bare 22-26AWG wire and insert them into the holes where the bulb wires were previously inserted.
Using a multimeter, determine which wire is positive and which is negative
Align the + terminal of the rechargeable battery in the Jabra with the positive wire identified on the flashlight - do the same with the negative terminal. Hold the flashlight on the battery for a minute or so to allow some of the current from the light to slightly charge the jabra battery.
Before putting the Jabra back together, try the AC or USB power cord - you should now get a solid red light if it is charging.
If not, try to "jump" it again for another minute or two or three.
If this doesn't work, the battery is probably totally shot - maybe you'll have better luck finding a replacement than I did.
The Maglight isn't necessary, but it is a simple way to obtain the 3.0v DC power source. You could use a similar power source to obtain the same effect (probably 2.7-3.7v DC is best).

Posted on Jan 30, 2010

  • 2 more comments 
  • flynnhart1 Nov 11, 2010

    "Jumpstarting" the battery worked for me. I used a small DC power supply to provide the charging current to the battery. Thanks for the tip!

  • warmoes Nov 17, 2010

    this was a very good advice. Thanks to you I brought a very old Jabra 250 BCE back to life.
    The Jabra helpdesk told me that a replacement of the battery was not possible.
    I used also a DC power supply, it was dificult because it is all so small but th headset is working very good again.
    Thanks Ruprik.

  • asweber411 Feb 25, 2011

    I taped together 2 AA batteries in tandem with bread ties , one at each end for wires, and held them to the Jabra battery terminals, and it WORKED! It's attached to the USB on charge now, and the light is solid RED, whereas, before, it would flash green once when I hooked it up to charge, and then nothing. Thanks for the tip! I paid $4.00 for this thing at a yard sale, Don't think it was ever used. Let's see if I can get it resurrected!

  • Jamie Nov 28, 2011

    Can anyone provide a photo showing how to jump start the BT350 battery?

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So for pictures of disassembly, and of the interior including the battery, see the instructables link above. No pictures of actually jumpstarting, but here's a description that I hope is clear enough to be useful.

For me, I didn't need a multimeter to determine the battery polarity: the + and - were marked right on the top of the battery, about 8mm from the edge of the battery that attaches to the motherboard. Look for it, it's small, but it's there.

As for the jumpstarting setup, I simply used some scotch tape to put 2 1.5v AA batteries together in-line, attached a wire (actually, 2 xmas tree ornament hooks bent straight) to each end (also with scotch tape), and then touched the wire on the + end of the AA battery contraption to the + lead on the Jabra battery and the - end similarly. (+1 to asweber411 for this idea) Held for about 30 seconds, got tired of holding the whole bloody thing (it's small, my hands are shaky and my eyes are not great) but even 30 seconds was enough - this worked like a CHARM! I was totally skeptical at first. Props to Ruprik for this fix, it recovered a 2-year dead Jabra BT350 today and made me a very happy camper.

Important tip, don't reassemble the whole thing before trying to plug in the charger to see if the red light will stay lit after this procedure. If you have to do it 2 or 3 times (or, if like me you're shaky and not 100% sure you had good contact) it will save you from a disassemble/reassemble cycle.)

Posted on Mar 14, 2012

  • Chris Forrester
    Chris Forrester Jul 30, 2014

    Hey I would like to thank the guys on this thread and especially timc889. I have had a broken set of ear buds that came with my phone limiting my hands free talk and I found my old jabra from years back. Flashed the green and wouldn't hold the charge and you guys helped out a ton!!! I hope to pass on the good vibe!!!

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This worked perfect.
I was a little confused and had the battery only on the + Bluetooth + terminal.that didn't work. I re configured my two double aa's batteries taped together with two small pieces of wire.hardest part so far was holding the wires on both.
I only held mine on for ten or so seconds.
my foil got trashed when I was taking it off it all stuck to the device. I think im going to hit it with a sharpie or cut some foil and glue the faceplate back on.
I have no training in this field. Thank you your instructions are very good.

Posted on Jan 29, 2015

  • chads mullinary
    chads mullinary Jan 29, 2015

    also if they made the black piece that hold the ear piece removable you would be able to do this without opening the device.

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Crazy thought do you think it would be a similar solution to jump start a dead laptop battery? don't try this unless one the gurus gives us an answer. it would be very dangerous to try it without their thoughts on the matter.

Posted on Nov 10, 2012

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