Device guides
When you know the device but not the spec, start here. Each guide gives a direct answer plus the context to understand why — so you can substitute confidently when the exact part isn't available.
Browse by topic
🔋 Battery guides
Common household devices and the exact battery type they require.
💡 Lighting guides
Which bulb base each fixture uses and what to look for when replacing.
⚡ Fuse guides
Automotive and electronics fuse types by application — type, amperage, and safe substitution rules.
🔩 Fastener guides
The right screw, bolt, or anchor for wood, drywall, masonry, and outdoor applications.
🔌 Cable guides
The right cable for 4K TVs, fast charging, monitors, headphones, and more.
🔍 Interactive tools
Have a battery code you can't identify, or want to check what's interchangeable? The lookup tools give instant answers.
- Battery Code Lookup — search by any code or alias
- Bulb Base Identifier tool
All guides follow the same format: direct answer first, then dimensions and substitution context. No filler — just the spec you need.