The 3800 battery is made by innocel. Google it, innocel sux
I broke down and got the Seidio 3800 battery for my GNex and I must admit I am thoroughly impressed. I am on my third conditioning cycle and already getting an average of 40 hours between charges with moderate to heavy use. Was a little leary going back to Seidio after the last fiasco with their extended battery for my Thunderbolt, which came no where near the advertised specs. I love my GNEX now.