It can be believable to a certain degree. For example the official PSP Extended Life Battery has a capacity off 2200mah compared to the normal 1800mah for PSP 1000 series with the same dimensions of said model. Of course if a battery claimed to have say 3600mah of the same size as the 1800mah/2200mah battery then that's a big fake. Whatever the case, watch out for fakes whether it's normal or extended as those may have less capacity than advertised. I posted a news article about such a case, right here. Note the pictures are sadly missing as the site that hosted them went down ages back. -_-
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