afaik all batteries today are lithium, at least all those CRxxxx types. there is no such thing as a dedicated 10 years battery. according to casio the 10 year lifetime got something to do with a "special hardware development in the module", but I don't buy that, for me it is simply marketing BS.
take a mudman G-9000 and a G-2900 for instance: both use exactly the same type of battery - a CR2025. in the mudman case casio claims an approx. lifetime of about 3 years, in case of the G-2900 they speak of "10years battery", so go figure....
hmmm, same battery? That's odd. I did't know that. Maybe because mudman has some features that consumes more power? But than all basic model sholud have 10y battery life. I red that some of old g-shock have batteries over 10 years without replacement. Also I saw some analog casios with "10 year battery".
a CR2025 3 volt lithium battery has an average capacity of about 170mah. thats quite a lot for such a small, low power consumpting item like a wristwatch. of course it all depends on how often one uses el-backlight, alarms etc. but I'm willing to bet, that a CR2025 is capable of running 10 years in more than 90% of all watches (with execption of ABC watches).
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