Battery free glasses for 3D are better if they are being used with passive 3D televisions.

LG only have passive 3D television so the battery free glasses work with them. The other premium brands such as Samsung, Sony etc all use active 3D and their glasses are battery powered. The active glasses are far better for use with active televisions because the battery free glasses won't work with them.

Previous criticisms of active glasses were weight and battery life. With the weight below one ounce and battery life of over 100 hours, neither of these are issues any more.

Battery powered 3D glasses means they are active 3D glasses and they only work with their own manufactured brand. However the compatibility of passive 3D glasses for other TVs are much higher. They work on any 3D TVs or theaters if they use the same passive technology. The passive 3D TV glasses are also lightweight due to no batteries being attatched. Plus, they don't need to be charged everytime before/after use unlike the active ones.

Yes, the electronics gps system is battery powered. There are now a number of battery powered gps units available.

It is battery-powered

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