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The Logitech Freepulse wireless headphones have a "non-replaceable" Li-ion polymer battery. Of course, once the battery runs out of juice, that makes it a very expensive paperweight. Repair fix!

Steps :

1. Battery is located on the left headphone, the one without the power button and power plug on it
2. Removing the small screw on the inside of the ear piece.
   • The screw is a tiny Allen Wrench head, smaller than my smallest wrench, a 5/64.
   • I was able to use a small flat head screw driver to turn the screw, the screwdriver head was approx 1mm.
     

     
     

     Small Screw removed from headphone
3. There is also a small metal collar at the end of the headphone
   • use a small flathead screwdriver to slide the collar onto the rubber wire connecting the headphones.
4. Once the screw and collar are removed, you can force a screwdriver into the gap in the plastic between the top and bottom pieces of the headphone, and pry the two main pieces apart.
   • There will be some resistance, but nothing seemed in danger of breaking when I pried them apart.
     

     
     

     Separated halves of the headphone.
5. Remove the battery packet
   • The packet is glued to the side of the unit. I was able to pry it off, without the packets foil ripping. Probably doesn't matter if it does rip, since it's now a used up battery.
   • It's connected by a small remove-able electrical plug that offered some resistance, but came off cleanly.

Tips :

• Here is the only hit I found for the battery part number, on the Online Certifications Database.
• http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?name=BBFS2.MH10048&ccnshorttitle=Batteries,+Household+and+Commercial+-+Component&objid=1078080586&cfgid=1073741824&version=versionless&parent_id=1076519666&sequence=1
• The battery size is approximately 25mm x 25mm. The headphone will not hold a larger battery.
• The connecting cable has a red, black, and white cable connected to a small power connector.
• It is important that the new battery be 3.7v.
• Matching the 265mAh number is not important. That just describes the battery life on a charge.

Warnings :

• Disposal of battery
• from http://forums.all-battery.com/index.php?showtopic=279&pid=558&mode=threaded&start=#entry558
• How do I safely dispose of dead or damaged Lipo packs?
• If possible, discharge the pack down to zero voltage using a motor, light bulb, etc. Next gently puncture the outer cases of the cells and let it sit in saltwater overnight. Remove 24 hours later, wrap it up in a plastic bag and toss in the trash.

Things You'll Need :

• A replacement for this battery:
  1. Synergy
  2. P/N AHB472625PST
  3. Li-ion polymer
  4. 3.7V 265mAh
  5. Made in China
  6. 25x25x5mm
• all-battery.com is an excellent source, with specific dimensions,
• http://www.all-battery.com/37vli-polymerandli-ionbatterypacks.aspx
• The best current fit is a 25x20x5mm Tenergy Polymer Li-Ion Battery 3.7V 250mAh
• http://www.all-battery.com/polymerli-ionbattery37v230mah501638.aspx