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Each machine core supplier has the different pledge to its batterylife, if west machine the core battery life generally is 2-3year, some machine cores can amount to for 5 years even 10 years.General saying, machine core thinner, smaller, its battery thinner,smaller, then the battery life corresponding is shorter. Because themany kinds of other factors also can affect the battery the life, like replica watches needle length width (weight), battery manufacture datesooner or later and hand replica watches stock time length and so on