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These are normally referred to as passive or circular polarized glasses.
They produce ZERO flicker and very low cross-talk (very important when watching 3D).
The horizontal viewing angle is indeed very wide (as far as 3D goes) but the vertical viewing angle is quite narrow. For this reason it's not a good idea to mount passive sets high on the wall (unless you point them down) and table mounted is probably ideal.
There is no such thing as battery free 3D glasses.
There are 2 types of 3D glassess - active and passive.
Active 3D glasses need power, and different makes of TV may not be compatible with each other.
The battery free glasses you referred to are actually passive 3D glasses. There are also different types of passive glasses but generally circular polarised glasses are used such as those used in cinemas (real 3D) and almost all of the passive TVs available so far.
Whether the 3D is good very much depends on the TV, not the glasses. Different passive glasses make very little difference in viewing quality.
@Celsius, Jason. Thanks for the advice.
Jason, sad to know your purchase of glasses from ebay has been bad. But there have to be some options avialable apart from those supplied by the company. Any big brands out there for the same?
As mentioned already, all present passive TV adaopt circular polarised technology.
The other is of course, linear polarised technology which some cinemas adopt.
Therefore the glasses are not compatible with each other.
Fewer and fewer cinemas now use linear polarised screens, but many still remain (e.g iMax).
Therefore the glasses you get from a real 3D cinema can be used with your passive 3D TV (LG/Philipps/Toshiba) but those from iMax cinemas cannot.
Active vs passive is always a debate, you should research their pros and cons, see for youself, and then decide for yourself. My own preference is passive, considering many factors.
Polaroid offer 3D passive glasses that will work with all the passive TVs on the market. They are very good glasses as well by all accounts and do improve the image over the LG models. There are also Oakley 'Gascan' 3D glasses. They cost more money of course: