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Product model: 201020 Nominal capacity: 40 mah Product size: 2.0 MM thick (+ / - 0.2 MM) wide 10 MM (+ / - 0.5 MM) * 20 MM (+ / - 0.5 MM) Rated voltage: 3.7 V Charging voltage: 4.2 V Charging temperature: - 30 ° ~ 40 ° C C The discharge temperature: - 30 ° C ~ + 60 ° C Storage temperature: - 20 ° C ~ + 30 ° C