My first impressions of Seidio 's Innocell 3800mAh Super Extended Life Battery with back door for the Galaxy Nexus LTE... I will comment on the battery life after 3 charge cycles.
The matted back door feels nice to the touch, really nice, almost like the rubber/plastic on the Motorola Droid's (I hate shiny plastic). The extra weight and the protusion/extra thickness actually make the phone easier to hold with one hand. The back door sits nicely on my palm, and less slippery now. I sorta feel like I was holding the HTC EVO. The back door fits perfectly, no gaps. The phone still sits flat on the table. The phone is thicker now, but not quite double. Yes, it still fits in my jean pockets comfortably.
Now, the negatives... I wish the door was grey instead of black like the Nexus. I do not care for the Seidio logo. There is a wasted space in the door. Seidio should have made a flatter battery and put some cells in the empty space around the camera instead of leaving it as empty air. If they had done this, I bet they could have minimize the thickness by half. The battery back cover does take away the sleek look of the phone.
In summary, I feel like it looks better in real life than the stock pictures online, but yes the sleekness of the phone is gone. The phone is also better to handle now. If I can get two days with medium usage out of it, I am planning on keeping it on as my main battery. I had a Bionic with an extended battery before, and the extra cells make my day so much better not having to worry about running out of juice (2 days easily). I am still on the first charge cycle, but it appears it will last me two days, based on the percentage (4G/GPS on, wifi/bluetooth off). Will keep you posted in a few days.