Originally Posted by Cptnodegard
52 hours is for AUDIO not video or recording.
... and only for 128k MP3, no EQ/BBE, backlight off, no track skipping, etc, etc... typical fairytale measurements. Still, the real-world battery life on my D2 is still pretty good after ~16 months.
I only ran my battery dry 3 or 4 times, I usually keep my D2 plugged into an USB port when I don't use it. That's what Li-Ion batteries like. Read more about battery care here: http://www.batteryuniversity.com/parttwo-34.htm