So far that 'd depend on how much you use the leds.
If you'd use them always, I fear you won't even make it through the day with the battery (meaning less than 8 hours).
However I read somewhere the leds have 3 powersettings (off, moderate, full), and if you don't turn them on at all, they won't lose battery at all.
The touchscreen will most likely reduce average battery life by 1/3th (meaning in the likes of a weekly charge).
Using the Leds might lead you to recharge every few days (just like a normal cellphone).
Things could change if Sony upgraded the internal battery (which I hope they did).
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