🔋 Introduction
Battery lifetime is not fixed—it depends heavily on how deeply you discharge it.
📊 Key Relationship
| DOD | Cycle Life |
|---|---|
| 100% | 3000–4000 |
| 80% | 4000–6000 |
| 50% | 6000–10000 |
🧮 Calculation Formula
Lifetime (years) = Cycle Life ÷ Annual Cycles
📈 Example
Case 1: 100% DOD
- 3500 cycles
- Daily use
👉 3500 ÷ 365 ≈ 9.6 years
Case 2: 80% DOD
- 5500 cycles
👉 5500 ÷ 365 ≈ 15 years
🔍 Key Insight
👉 Reducing DOD can extend lifespan by 50% or more
⚡ Engineering Tip
Always design systems with:
👉 margin (avoid full discharge)