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EN-MH1 and EN-MH2 are designations used by Nikon for their rechargeable Ni-MH batteries used in their cameras and other devices. The primary differences between the two lie in their capacity and possibly other characteristics like charge-discharge cycles and self-discharge rates. However, without specific technical data or documentation from Nikon, it’s challenging to provide precise details on their variances. Typically, an upgrade from EN-MH1 to EN-MH2 might involve improvements in capacity, longevity, or charging efficiency, but exact specifications would need to be obtained from Nikon or outlined in the product documentation for each battery type. If you’re considering upgrading or replacing batteries for a Nikon device, it’s best to consult the manufacturer’s documentation or contact Nikon directly for the most accurate information.