Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: How do you change the battery in the headset
Document: I am able to put the Sony's on the recharge unit in the morning, and it knows when and how long to charge. Also, when Sony's battery life is over, the battery is expensive ($25) yet a simple change, where as JVC's had to be sent in for service.Another good point about Sony's is that when pressure is applied to headband, it turns them on.
Regrettably, despite it's slick appearance and renowned name, it is not in that category.UPDATE: In fairness to this product I must edit my rating; with a battery change it is now functioning as advertized and we are decidedly happier, so I've upgraded to four stars.We replaced the battery that came with the headphones with a 700mAh Headphone Battery (also available through Amazon) and the transformation was dramatic.
This is the second time I bought these headphones. My first pair ( the same model) I bought at 2009 and used them three years almost every day ( until my child broke the plastic part). They were connected to my TV, and I used them when i wanted just to listen to the program and do something else in the kitchen or in the other room. During three years the headphones did not require any maintenance ( I did not even change a battery).
Sound quality is great. the box dosent say surround sound but it sounds like it does. I have been using it for a few weeks and have yet to change the battery. Lots of people are talking about white noise when they listen to music or other things and ive never had that problem. i work in an office with 11 wireless computers and phone lines and never lose signal.Cons:The only problem ive had with these is they have cut out when my house phone rings.
Overall the sound quality is more than I expected initially. Good quality with exception. The battery usage life is more than adequate and minimizes charging need during the course of a nights viewing. But there's a rub.The issue that comes up is the occassion where suddenly, without change in seating position, the unit will transmit static and go off and on several times in a row. Then, subsequently, operate properly. Additionally, the headphone housing is made of a plastic (?) material.
I've had this for a little over two years now, and i'm really pleased with it. I'd read some bad reviews before i bought the headset, but i didn't have any of those problems. I'm here just to get a new battery so that i can have one battery charged all the time.
Not only is the battery life excellent and as advertised, but I save $$ by not buying a pair of overpriced headphones (Sony PS3 Wireless headset) that only works for one A/V component in my home theatre setup. Thanks Sony!
I don't think the unit shipped to me was new. The battery was installed and the orginal packageing had been opened. The tuning button is missing, so the headset can not be tuned. Headset has been returned to Sony for warranty repair and is not expected back for two weeks.
I can not use this item as much as I would like to since when I am wearing them I hear some interference which is really annoying. Another thing is it's short battery which reduces the time of the constant headset wearing even more
This is my second pair of Sony wireless headset, love this product. Does not lose signal if I go into another room. My other pair lasted almost 4yrs, only had trouble with reception after dropping it. Battery life is great, longest use was approx. 6 hrs with no cutouts.
Answer: Hi Toni! You don't need to change the battery if it is not broken. It will automatically charge itself once placed in the base/transmitter. In case you want to change the battery, you can press the "PUSH" button on the left housing to open the battery compartment lid. -Anthony