Originally Posted by GEP
Just as a matter of accurate information, the battery used in Xpand X103 or 3DG-X103 glasses ARE NOT special batteries!!! They are standard CR2032 coin batteries available in drug stores, super markets etc in the camera/watch battery section. Also found in stores like rat shack. And can be ordered from the internet for low prices, http://www.bing.com/shopping/cr2032-...M=EGCA&lppc=16
The advantage of replaceable batteries is if they die during a movie, it takes only a few minutes to replace and get back to the movie. Rechargeable take several hours to recharge, delaying the completion of the movie.
Ok, as long as we're getting into the details of "accurate" information:
By "special" batteries, I meant they're not simple AA, AAA, C or D batteries, which are the only ones you be guaranteed of finding at any given time. It's true that CR2032 batteries are not especially
difficult to come by, but no, not every supermarket carries them, and the price per battery is pretty ridiculous at retail locations (compared to online bulk purchases, if you think ahead and have time to wait for shipping). I happen to have large amounts of CR2032's on hand, but only because I use them for some specific purposes... but I promise you my mother would not be pleased about having to track down special batteries for her glasses. I'll bet a poll of people in this thread would reveal less than 50% of the participants have even heard
of CR2032 batteries before, let alone know exactly where to find them on short notice.
As for the rechargeables, you are WRONG: There is no "several hours" of charging, EVER. A 30 minute charge delivers 25+ hours of use (that's a full charge, btw), so it's really not a hardship of any sort to charge them. In the unlikely situation where it does give out in the middle of a movie (purely user error, under the circumstances), a 5 minute charge gives 2.5 hours of use! Roughly the same amount of time it would take to locate and change the batteries for the Xpands, so again, no real advantage there.
And finally, while not a huge deal, there is at least some level of higher environmental impact for disposable batteries vs. rechargeables...