Prepare the cell
Remove the battery with the device powered off. Keep metal tools from bridging the positive and negative terminals.
Measure the envelope
For a round cell, record maximum diameter and height. For a pack, record width, depth, height and the terminal arrangement.
Treat size as a filter
Measurements can identify candidates, but they cannot prove chemistry, voltage, rechargeable status or safe device compatibility.
Decision boundary
This guide narrows a battery decision but does not override the device manufacturer’s current manual or safety instructions.
Sources
- International Electrotechnical Commission — IEC 60086-1:2026 — Primary batteries, general requirements
Primary-battery nomenclature, form, fit, function, terminal and electrochemical-system framework.
- U.S. Consumer Product Safety Commission — Button Cell and Coin Battery Safety
Coin-cell ingestion and household handling safety boundary.