camera explained

Why are most of the camera manufacturers using AA batteries.?
I want to buy a Digital camera with high optical zoom. I shortlisted Sony H5, Canon S3 IS. Both use AA batteries. It is difficilt to take out the AA batteries every time , put them in a charger and charge. Compared to lithium battery it is big hassle. Why are they using AA batteries ??
Secondly Canon has no built in memory in their cameras , could you explain the possible reasons for this and can some one from Canon reply to me as well.
they’re available everywhere, and thats convenient. also, you can get a high level nimh battery set and charger for decent money, and they’ll live a long time.
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