Battery Testing Methods
| Test | What It Measures | Key Standard | Why It Matters |
|---|---|---|---|
| CCA | Cold starting power at -18degC | SAE J537 | Cold climate starting |
| Reserve Capacity | Runtime without alternator at 25A | SAE J537 | Emergency power |
| C20 Capacity | Energy storage over 20 hours | IEC 60095-1 | System sizing, deep cycle |
| Charge Acceptance | Recharge speed at 14.0V | EN 50342-6 | Start-stop compatibility |
CCA Standards Are Not Interchangeable
A battery rated 500 CCA (SAE) may be 550 (EN) or 400 (JIS). Always check which standard is referenced.