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As far as specifics, let's say that pushing the light button once is the equivalent to 1 day of battery life without using the light. So, if you were to use the light once a day for 10 years. it would shorten the life from 20 years to it's estimate of 10 years.

In reality it's probably even more than a day because most watches don't even have a 10 year estimate.

This is why I prefer the "Ten Year" models. Their dim light doesn't use nearly as much power. I suppose the solar models are good too, but I haven't used them as much.
 

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I read that the non solar 5600 watches will last 10 years. Does this include back light usage? If yes, how often can you use it?
I'm not sure about the 5600 models, but the 10-year-battery Casios I have (AE-1200 and AE-2000) specify 1.5 seconds of illumination per day.
 

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I read that the non solar 5600 watches will last 10 years. Does this include back light usage? If yes, how often can you use it?
Casio's battery estimates usually include most normal features that a given watch has, like back light usage, alarm usage, and power save and/or radio reception if applicable -- AND THE DURATION OF those usages.

These estimates are almost always in the owner's manual, generally towards the end.

1) Decide which model(s) you're most interested about.

2) Go to Casio's database of watch manuals at Timepieces(Watches) - Manuals - CASIO and enter the thee- or four-digit MODULE number (not the model number).

3) Repeat as needed.
 

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According to the Casio site the standard DW5600E uses a CR2016 rated for approximately 2 years. I do not own a DW5600E, but my '07 DW9052 is also equipped with a CR2016 rated for approximately 2 years. I don't use the light, and my 9052 is still on its original battery. Not an apples-to-apples comparison I realize, but anecdotally suggests with careful use 10 years is not an unreasonable expectation. YMMV.
 
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