All batteries with the prefix of CR are lithium 3 volt. The first two numbers, 20 is the diameter in mm and the second set of two numbers 25 is the tenth of mm in thickness, ergo 2.5 mm height.
This is from the American Watchmakers-Clockmakers Institute 2008 Edition "Handbook on Battery Number System". This Battery is cross-referenced as: AWI L12, Citizen 280-205, Duracell DL2025, Seiko SB-T14, Timex NA, Varta CR2025.
The coin-type lithium manganese dioxide battery is a UL (Underwriters Laboratories Inc.) recognized component and user replaceable, Certification Number: MH12568 (N). Batteries with the prefix of CR are lithium 3 volt. This is a non-rechargeable primary battery. Dispose of properly according to your local regulations.
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