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battery life in simple, comprehensible numbers?

I've yet to find even a single review site, where the 'battery life' or even the battery type can be isolated...

What, I'm not supposed to know that i need 468 batteries to run a camera for 20 shots if i don't remove the battery after ever picture? (this is the problem with my current camera, if i leave batteries inside the camera, it won't take not one picture, furthermore, i have to recharge my batteries the DAY I USE THEM now i know my nimh batteries are over 6-7 years old now, but they run for 4-5 hours straight in my modded GBA with a Front light kit ...

My dad and sister bought new cameras around christmas, and they bough the new ultra portable size cameras with a rechargeable li-ion battery, but my understanding is that li-ion batteries can lose as much as 20% of their capacity each year.... so how often are people going to have to buy new, expensive li-ion batteries because after 1 year of sitting they can only power the camera for 5 minutes?!?! (unless the li-ion only lose duration, and not voltage, in which case they might go from powering 40 shots to powering up to 32 shots, and again not one camera lists in number of shots per new battery life... so again we're in the dark about this)

I mean with google to aid me i still only found 'old' (2004) reviews mentioning battery life, but even those pages didn't lead me to keywords to search for other cameras, boasting battery life, because the only acronym on the page is 'shared' with the 'Childrens Internet Protection Act.' CIPA... why the heck would camera makers intentionally use an acronym that is going to lead you to pages about protecting kids from the internet?!?!?! Oh wait, because THEY DON'T WANT YOU TO KNOW how long your battery will run in your digital camera.

well, i at least found one place with fourms... so i'm going to ask there for help, as well, but it drives me nuts that something so important like battery life isn't even mentioned by reviewers of cameras etc.