The CellChart blog
How button and coin batteries are named, matched and replaced.
How to dispose of and recycle coin cell batteries
A dead coin cell is not a harmless one. Tape it, keep it out of reach and take it to a battery drop-off, not the kitchen bin.
storageStoring spare coin cells: shelf life, heat and loose cells
A sealed coin cell can sit for years and still work. A loose one in the junk drawer is a short circuit, and a child safety problem, waiting to happen.
markingsHow to read the code stamped on a coin cell battery
Turn the cell over before you buy a replacement. The engraving is a size, a chemistry and a polarity, and it is the only reference that never goes out of date.
capacityCoin cell mAh is not runtime: why same-size cells differ
The mAh number on the packet is a test result, not a promise. Four things between that number and the date you next open the battery door.
rechargeableRechargeable coin cells: LIR, ML and VL explained
Three rechargeable families share their cases with ordinary CR cells. Only one direction of the swap is dangerous, and it is not the one people fear.
AirTagAirTag battery: which CR2032, and the bitterant catch
Apple asks for a bitter-coated cell and warns in the same breath that some coated cells will not work. Both halves matter.
watchesWhy your watch battery dies fast: SR vs LR explained
The chemistry letter on the cell decides most of the answer. The rest comes down to drain, storage age and a few habits.
safetyButton battery child safety: risks, Reese's Law and first aid
A swallowed 20 mm lithium coin can burn through an esophagus in two hours. Here is what the law changed and what to do in an emergency.
watchesWatch battery size chart: which cell does your watch take?
Find the right cell by code, learn the SW versus W difference, and know when the job belongs at a jeweler's bench.
namingBattery naming systems explained: IEC, ANSI and AG codes
One tiny cell, five different names. Here is how the three naming systems work and how to translate between them.