NiMH battery machine knowledge - interpretation of 4 cycle operation
| Cycle | Charge Purpose | Discharge Purpose | Capacity Trend | Quality Indication |
| 1 | Break down crystals | Reset memory effect | Low (baseline) | Poor initial state |
| 2 | Enhance electrode activity | Recover dormant capacity | Moderate increase | Improving responsive |
| 3 | Refine balance, maximize recovery | Test sustained capacity | Near peak | Good if close to rated capacity |
| 4 | Lock in conditioned state | Confirm final performance | Stabilized (max recovery) | High if capacity & temp are ideal |
Some key findings can be concluded after 4 cycles running:
Practical Interpretation
Progressive Increase: Capacity rising steadily (e.g., 4.5 Ah → 5.2 Ah → 6.0 Ah → 6.2 Ah) with decreasing temperature peaks shows a healthy reconditioning process and a high-quality outcome.
Stagnation or Decline: Little change (e.g., 4.5 Ah → 4.6 Ah → 4.7 Ah → 4.6 Ah) or a drop after Cycle 3 suggests poor quality—reconditioning can’t overcome physical degradation.
Temperature Context: Pair capacity data with temp curves. A 6.0 Ah capacity at 30°C (Cycle 4) is better quality than 6.0 Ah at 50°C, as the latter hints at inefficiency or damage.
Final Tips
Use a controlled environment (e.g., 20-30°C ambient) and consistent charge/discharge rates for reliable data.
If Cycle 4 capacity is below 80-85% of rated value or temperature exceeds 45°C, the battery may not be suitable for HEV demands despite reconditioning.
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