Bose Bluetooth headset Battery replacement

The battery of my favorite Bose Bluetooth headset is almost dead!!

I replaced new battery bought at Akihabara.

New battery 3.7V 85mAh, originaly 90mAh

Disassemble headset

Notice two holding pins.

Lithium polymer battery must be soldered carefully.

My Bose headset becomes refleshed!!

Nov. 5. 2017 added

Dear many friends!!

Thank you for much comments. I'm sorry because my Bose headset has broken....