battery problem (after 7 months)

Update:
after 7 months, the battery has to start making short circuit, overnight one day without using it, and then the battery was short circuit, even the helmet off, I was afraid of explosion.
I had rushed to remove the battery.
Thank amazon for reimbursement via the two-year warranty. This is my 3rd Sennheiser product with my second with worry after a few months, and my third dissatisfied 3 in the end. I is not had any problems with other helmets.
I'll go to another brand: monster cable for Nokia given my use (purity pro), better than the beats and with the feature, I open it and turns on the NFC + and anti noise activated once the helmet on the head. This will add manipes me much less and more fun in transport. This helmet was sorely lacking bass and deactivation was very ergonomic long-term or activation (that is the tact that we must hold to turn it on, otherwise it enters pairing mode)

but here are my old comment I spent good time with this helmet still

This helmet is incredible
I will list the positive and negative:

MOST:

+ Beautiful exterior design (no LED is blinking bluetooth fashion / anti noise unlike the old model, discreet and saves a little battery)
+ Superior sound quality is all I've owned (and intra aural headphones supra open seinnheiser, helmet and intra koss ...)
bluetooth and very good quality.
+ Comfortable for people wearing glasses (low downforce trais area between the branch and the ear, circum aural headset based on the plug at the temples)
+ Build quality and feels solid.
+ TalkThrough function very useful, we get along perfectly well talk and hear people talking a close outside.
+ Telephone call qualities, we agree to talk with the return of our voice with two microphones unlike traditional handsfree ITE-Ear
+ Anti noise performance, with music we not hear people speaking in front of us. And eliminates most background noise.
+ Intuitive: you turn the headset connects to our phone connected by Bluetooth, we can resume the music if it had been left paused. No need to get all its mobile:
we can execute voice commands if the phone is equipped with hands-free voice recognition (Nokia for example) to make calls.
You can redial the last number with pressing the Bluetooth headset button
+ Compact, is easily stored in its package.
+ Many useful accessories
+ Price (with discount from Amazon)
+ Qualities buttons.
+ Bows adjustable in length, strong and retain their screens easily.
APT-X codec + available (not tested) that enables bluetooth CD quality
+ Light
+ 20H Talk noise-guard fashion + connection jack (bluetooth)
+ 10H autonomy listening / bluetooth on appeal

LEAST:

- The arch is stretched by notch is maximum for me to wear it properly, so if you have a very large head could not agree (I put the XL motorcycle helmet) limit for me.
- Small scratches scattered in several places the helmet on the matte plastic, printing a demo of the product opening.
therefore plastics sensitive to friction.
- Activate the noise canceling / talktrough when listening to music when the headphones are plugged into a jack device adjustable apart for another helmet: raises very strong sound in a very short period. no worries if connected jack directly and no worries as bluetooth mode.
- To store the helmet in his case, it is necessary to lower the hoops up and thus lose its setting and play the notches on each storage.
- The noise function did lose some certain frequencies of sound (bass ...)
- Bluetooth: music makes small jumps sometimes on my phone model (Bluetooth 3.0, Nokia PureView 808)
loss of sound quality felt between the wired headset and the passive mode bluetooth mode if our device does not possess the APT-X codec.
- Shape of the helmet once worn with arches stretched to the maximum is not very subtle (helmet a little square, alien head ...)
- Autonomy of 8H + Noise guard bluetooth.

CONCLUSION:

I am very satisfied with the helmet, little pressure on the ears but do not worsen over time and with practice we forget, despite wearing glasses (right frames).
The Bluetooth works well, very intuitive, efficient noise and Talktrough function keeps the helmet all the time in the same person to speak and listen lentourage, a message from the train or plane ...

Small disappointments on the limited headband adjustment for my big head and small scratches on the helmet.
making my 3 rd Seinnheiser product and not fully satisfied (after an intra down after only a month, without a supra low and the latter with some small defects)

I recommend it for sure to nomads in transport where it reveals its full potential with an excellent quality / storage facility / weight / compactness.
I use it at home for NoiseGuard function occasionally, and allows for quality sound by movements without the discomfort of a wire and the free hand pickup.

a very good pick for those wanting ease of use and quality. We can keep the helmet on his head under all circumstances and it is very intuitive for daily use (finished unraveling its cable, out away his phone ect ...)

I'm still happy for this Sennheiser and some function is astonished me, this helmet is indispensable once adopted.
a veritable Swiss Army knife hearing.