I don't see any change in battery life. I use my Retina Mini for a combination of web browsing and reading. The Usage screen in "Settings" is currently showing that I've used it for 5h 20m since the last charge, and the battery is at 68%. I consistently find with my usage pattern that I get a little under 2h usage for each 10% of battery charge. That's with WiFi on, and Bluetooth off.
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