Battery Guides
Practical guides for understanding and selecting automotive batteries.
Available Guides
| Guide | Description |
|---|---|
| How to Read Battery Specs | CCA, Ah, RC, C20 — what the numbers mean |
| Battery Groups Explained | JIS, DIN, BCI — understanding the group systems |
Key Concepts
CCA (Cold Cranking Amps)
The current a battery can deliver at -18degC (0degF) for 30 seconds while maintaining voltage above 7.2V. Higher CCA = better cold-weather starting.
Ah (Ampere-Hour / C20)
The battery's energy storage capacity. C20 means discharged over 20 hours. A 65Ah battery can deliver 3.25A for 20 hours.
RC (Reserve Capacity)
Minutes a battery can deliver 25A at 27degC before dropping below 10.5V. Important for vehicles with heavy electrical loads.
Battery Types
| Type | Technology | Best For |
|---|---|---|
| SLI | Standard flooded | Conventional vehicles |
| AGM | Absorbent Glass Mat | Start-stop, premium vehicles |
| EFB | Enhanced Flooded | Entry start-stop |
| Heavy Duty | Thick-plate flooded | Trucks, buses, construction |