From this article looks like a removable battery. But from the picture I notice the 4 contacts to the left of the laser guide. Two could be associated with the windowed cover and the other two I suspect might be for a wireless charger. Interesting if they can get a wireless coil to work with a metal back unless it's just plastic with a metallic finish.
LG G3 to feature microSD expansion and removable battery
Read more at http://www.trustedreviews.com/news/lg-g3-to-feature-microsd-expansion-and-removable-battery#wHcdMO5g4jLkO78c.99
LG G3 to feature microSD expansion and removable battery
Read more at http://www.trustedreviews.com/news/lg-g3-to-feature-microsd-expansion-and-removable-battery#wHcdMO5g4jLkO78c.99