(2-Pack) 3.7V 140mAh Li-Po Battery for Bose QuietComfort 3, QC3 | Fits 40228, 40229, PC40227, PC40229 and NTA2358 compatible noise-cancelling headphones.

Exact fit, initial charge took quite a while, now they charge up in 40mins. Quick Ship from AMZN. We'll see how long this set last, excellent price!

I gave this product one star only because I couldn't figure out how to give it a lower score. This product is supposed to be a direct replacement for the Bose 40229 battery. It is not a direct replacement. It will not charge in the Bose OEM direct plug in charger. One you use up whatever amount of charge is in the battery upon arrival, it is not chargeable and is of no use. DO NOT BUY if you have the OEM charger.

Worked great on our Bose headphones where we lost the original battery on a flight. Haven't used on shorter flights so the time length hasn't been challenged.

If you have a very old-style battery charger that plugs directly into the 110 v outlet when charging the battery, you may have to buy a new style charger with a detachable power cord as well. I ordered a set of replacement batteries from two different suppliers and none of them would indicate that they were charging when plugged into my old charger. They would power up the headphones though. I bought a new style charger and they all charged OK and worked fine when installed in the headphones. There must be a very slight dimensional difference in the two chargers even though they look the same! Also, the new batteries from ElXJAR had the part number label on the front side of the battery and it would not fit in the charger, you have to peal it off and put it on the rear side of the battery!

Looks just like the original battery. I was able to charge them on my original Bose charger with no issues. They fit perfectly into the charger and headphones. Used both new batteries on over 20 hours of flights and neither battery ran out after over 12 hours of use each. I don't know how long they would have lasted beyond that but they work great so far.

Great long charge - I only charge (usually) once a day or (approx.) every 24 hours - even when I forget to turn off the headset itself (Bose QC3) ..

The best part is they fit in the headphones and looks original. They don't hold a charge. 20 minutes max is all I get out of each battery, even if I charge them for hours. Don't waste your money with these.

Didn't realize it came with two. One on charge one to bop with and the original on standby.