About batteries.fyi
Every time I needed to buy batteries, I did the same research all over again. What are the exact dimensions of a 9V? Which 18650 has the best capacity? What's the difference between CR2025 and CR2032? This information exists — it's just scattered across dozens of manufacturer PDFs and buried in datasheets nobody bookmarks.
batteries.fyi is the reference I wish existed every time I searched for reliable specs. No opinions, no "best battery" rankings — just objective technical data sourced from manufacturer specifications and industry standards.
Data Sources & Methodology
Primary Sources
- IEC 60086 series - International standard for primary batteries
- ANSI C18 series - American National Standards Institute battery specifications
- Manufacturer datasheets - Energizer, Duracell, Panasonic, Samsung SDI, LG Chem, Sony
- Industry catalogs - Technical specifications from battery suppliers
Quality Standards
- Cross-reference multiple sources for verification
- Cite original manufacturer specifications
- Include uncertainty ranges where appropriate
- Regular updates as new products are released
- Trusted domain whitelist for source verification
Objective Data Only
I deliberately avoid recommendations or "best battery" rankings. The goal is to provide accurate, comprehensive specifications so you can make informed decisions based on your specific requirements.
Trusted Sources Policy
To maintain credibility and data quality, only sources from trusted domains are displayed on battery specification pages.
Accepted source types:
- Official manufacturer websites (Energizer, Duracell, Panasonic, etc.)
- Standards organizations (IEC, ANSI)
- Established technical references (Battery University, Battery Equivalents)
- Trusted retailers with technical specifications
- Wikipedia articles (crowd-sourced but established)
Sources like random Google Docs, unverified blogs, or questionable domains are automatically filtered out.
What's Included
Technical Specifications
Voltage, capacity, dimensions, weight, temperature ranges, discharge characteristics, and cycle life data.
Standard Designations
IEC codes, ANSI codes, common names, and cross-references between different naming systems.
Device Compatibility
Common devices and applications for each battery type, helping you find the right replacement.
Current Database
Currently Documented
Traditional Batteries
- AA (LR6)
- AAA (LR03)
- AAAA (LR61)
- C (LR14)
- D (LR20)
- N (LR1)
- 9V (6LR61)
Lithium-ion
- 18650
- 21700
- 26650
- 14500 (AA size)
- 10440 (AAA size)
Button Cells
- CR2032
- CR2025
- CR2016
- LR44 (AG13)
- CR123A
Built by Kevin Smith at Centricle. No ads. No sponsored content. No affiliate links.