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http://www.amazon.com/Panasonic-CTL1.../dp/B0080GQBTU
This 2.3 volt button cell is used in Casio Watches. This lithium battery is rechargeable with solar power and it is a quality replacement battery that provides long lasting power. Lithium batteries Rechargeable in the sun 2.3 volts Performs in a wide range of temperatures from -20° C to 60° C Has a shelf life of
10 years