🔋 Introduction
A common question from buyers:
👉 “Why can lithium batteries go to 100% DOD, but lead-acid cannot?”
The answer lies in battery chemistry and structure.
⚖️ Key Difference
LiFePO4 Batteries
- Can handle 80–100% DOD
- Minimal structural damage
- Stable chemistry
Lead-Acid Batteries
- Recommended only 50% DOD
- Deep discharge causes damage
- Shortens lifespan rapidly
📊 Real Comparison
| Parameter | LiFePO4 | Lead-Acid |
|---|---|---|
| Safe DOD | 80–100% | ~50% |
| Deep discharge impact | Low | High |
| Cycle life impact | Moderate | Severe |
🔍 Why Lead-Acid Fails at Deep DOD
- Sulfation buildup
- Plate degradation
- Irreversible capacity loss
🔍 Why Lithium Performs Better
- No sulfation
- Stable crystal structure
- Better voltage stability
⚠️ Important Clarification
👉 Even for lithium:
- 100% DOD is possible
- But not optimal for long life
💡 Best Practice
| Battery Type | Recommended DOD |
|---|---|
| LiFePO4 | 70–80% |
| Lead-Acid | ≤50% |