Please select a valid battery code.
Input Parameters Specification
Active Select CodeThe printed base model code on your button or watch battery (e.g. CR2032, SR44, AG13) that needs equivalent replacements.
Chemical Voltage (V)Nominal voltage dictated by cell chemistry: lithium (3V), silver-oxide (1.55V), alkaline (1.5V), or zinc-air (1.4V).
Casing Sizing (mm)Physical diameter and height bounds in millimeters, critical to guarantee fit inside tight battery bays.
Cross-Reference ListLists compatible standard models across manufacturing labels (Duracell, Energizer, Renata, Varta, Maxell).
Formulas & Mathematical Logic
Lithium coin cell numbering codes follow exact physical dimension parameters.
Lithium Code parsing: CR [DD] [HH] (where DD is diameter in mm, HH is height in tenths of mm)
For example, a CR2032 battery translates mathematically to: Diameter = 20 mm, Height = 3.2 mm. This standard nomenclature makes finding equivalent replacement boundaries extremely accurate.
About This Calculator
Instantly find equivalent coin cell and watch battery replacement numbers.
The CalcBoy Coin Battery Cross-Reference Tool matches standard button cells, watch batteries, and lithium coin cells against equivalent models.
Cylindrical button and coin cells are widely used in watches, calculators, medical devices, motherboard CMOS caches, car key fobs, toys, and compact LED lights. However, finding replacement batteries can be highly confusing because different manufacturers use proprietary naming schemes for the exact same physical cell size.
For example, a standard 1.55V silver-oxide battery measuring 11.6 mm by 5.4 mm is called a 357 by Energizer, a SR44W by the IEC standards, a SG13 by some, and can even be substituted by an alkaline LR44 or AG13 cell in low-demand devices. Sizing errors can lead to loose battery terminal connections, excessive voltage drops, or system performance failures.
This interactive tool resolves these issues by mapping thousands of equivalent battery codes side-by-side. Users can choose any printed model code to instantly find safe nominal voltages, physical boundaries, and compatible replacement numbers from other global brands.
Main BenefitProvides clear equivalent models across global battery brands instantly.
Categories HandledDecodes consumer alkaline coins, long-life lithium cells, watch silver-oxides, and hearing aid zinc-air cells.
Voltage SafetyHelps prevent inserting incorrect voltages (like putting a 3V lithium cell in a 1.55V watch socket).
Casing MatchDisplays exact diameter and height measurements in millimeters.
Note: While alkaline (1.5V) and silver-oxide (1.55V) coin cells are often physically interchangeable, silver-oxide cells provide more stable discharge voltages, which is vital for analog watches.
Frequently Asked Questions
1. Can I use an alkaline button cell instead of a silver-oxide watch cell?
Generally, yes, if they share identical physical dimensions (e.g., alkaline LR44 instead of silver-oxide SR44). However, silver-oxide cells provide a very stable output voltage, which watches need to keep time accurately, whereas alkaline voltages drop gradually as they discharge.
2. Why do lithium coin cell model codes start with CR?
The letters indicate the cell's chemical composition. "C" stands for manganese dioxide lithium chemistry, and "R" indicates a round cylindrical shape format.
3. Are CR2032 and CR2025 coin cells interchangeable?
They both operate at 3.0 Volts and measure 20 mm in diameter, but a CR2032 is 3.2 mm thick while a CR2025 is 2.5 mm thick. A CR2025 can fit in a CR2032 holder but may be loose, while a CR2032 is too thick to fit in a CR2025 holder.
4. Why are hearing aid batteries packaged with protective tabs?
Hearing aid batteries use Zinc-Air chemistry. They are activated by oxygen. The protective tab seals the tiny air holes on the cell; once removed, oxygen enters and activates the battery's chemical reaction.
5. What is the typical shelf life of lithium coin batteries?
Due to the extremely low self-discharge rate of lithium chemistry, quality lithium coin cells (like CR2032) can retain their charge for up to 10 years when stored at room temperature.
6. Are watch battery equivalents identical across brands?
Yes. Although Energizer calls a specific silver-oxide cell a "357" and Maxell calls it a "SR44W", they are identical in voltage and dimensions and can be substituted safely.