Different batteries

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ok my loters I need your help. I know someone can help me out on this. There are so many different types of batteries now that I am totaly confused about them. I know I learned something at school but I finished school in 1999 so its not like i remember. What is the difference between them? Which are better? I am talking about alkaline and that sort of thing not brand or size as in 9v, aa, aaa