Use battery from 1 Samsung model in a different model?

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http://androidforums.com – Is it possible to use the battery from 1 Samsung smartphone model in a different Samsung smartphone model, to get better battery capacity, as long as the size is the same / fits? I have a Galaxy S Relay 4G that I am curious if I can use a battery from similar models (i.e: maybe a different Galaxy). Thanks! :thumbup: (General)