I hate the stupid battery--I either forget to charge it, or it gets left on

I have to imagine this was on purpose, to make it more likely you'll lose the battery, and have to buy a new one for $50..

If you put the headphones in your bag without the enormous case, chances are you'll accidentally switch them on, and drain the battery.

I find the rechargeable battery in the QC3's more convenient than the AAA sized batteries in the QC15's

In other words, if you run out of battery, that's it; you can't continue to listen (albeit without noise cancellation) whereas, with the Sennheiser, you can listen to music even with a dead battery.

The battery lasts a long time so I haven't been caught out with a dead battery yet, and I fly a lot.

Battery and charger are a bit expensive to replace but you happen to lose them

- They last at least 12 hours, but if you forget to turn the power switch off, the battery is dead when you want to use them again and you have to recharge the

The foam padding on the ear flakes and isn't durable, 2) the rechargeable battery can get a little loose and can cause a high pitch in your ears that is unbearably painful, 3) the thin connector plug wears our quickly

I'm had it for two years now and the only issues I have are simple, can't charge the batteries without removing it, instead of bringing a cable right to the headset

Unfortunately, I just purchased a new charger since the old one broke after recharging the battery all of three times

If I could improve, I would add an extra battery.

Sadly, they still have the nagging Li-ion battery that needs to be charged by a separate, stand-alone AC adapter/charger

If the battery dies on a trip and you didn't bring the non-standard (arghhh!!

(Before Bose) - they are comfortable, the battery lasts ages and THEY

The only real downside is the expense; it is possible to pick up a cheap spare battery from off brands on amazon.

The battery and the size of the battery back seem excessive.

the problem isn't the battery itself, it's that you for them to work at all, the battery must be on

When sound canceling is turned on they're fantastic but once the battery starts to die the headphone sounds begins cutting out erratically

Battery lasts good as well.

I hate being stuck halfway across an intercontinental flight, and have the earphones go dead, they do not deliver any sound at all when the battery is dead.

The battery is awesome.

Good battery life

The battery keeps falling off, and thus easily gets lost

It is also handy and portable with good battery life

Expensive Rechargeable Battery ( only one comes in the package )2

This is cheaper than using non-replaceable proprietary batteries

This is cheaper than using non-replaceable proprietary batteries

I can't understand why Bose would use a tiny, non-standard rechargeable battery to power them, other than to generate more revenues when you need a spare, or lose the original battery.

this is a great feature- it uses a compact bespoke battery, which is rechargeable

I bought Quiet Comfort 3 because of its compact design and rechargeable battery

Only thing I wish is that they would work, sans noise canceling, without the battery, but still super happy with the purchase

If the power is turned off or the battery is dead, you can't listen to anything (even without the noise cancellation)

I'm not much of an audiophile, but these $350 headphones don't seem to cancel noise nearly as well as, nor do they sound much better than, my cheap Sennheiser CX200 earbuds

They have lasted plenty long for our domestic flights as well as to the Caribbean

They work very well with my Flat screen smart TV, as well as with my computer and laptop