Thread: PRS-T1 Case Sony PRS T1
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Old 12-13-2011, 05:45 PM   #178
seabee
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Quote:
Originally Posted by Bear 100 View Post
The combination of a small LED light plus Lithium battery will last a long time. That is why the world is switching to LED lights and Lithium battery.

The battery CR2032 is rated at 225 mAh (minimum required as per the specification). A white low energy LED can use as little as 0.02 mA. Doing the math that gives you >10,000 hours or 470 days! I do not know how many LEDs are in the Gecko nor exactly the draw of those LEDs, but you get the point - it will last a long time.
I think you made a unit error: a typical low power LED needs between 0.002A and 0.030A (2 to 30mA), and 2mA is for the most efficient ones (red, not white) and they're not very bright. If the CR2032 is ratted 225mAh, the autonomy is in the 4 to 50 hours range (2 LEDs), certainly not 10000 hours !
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