Mobile Phone & PC Batteries

• Avoid: SOC <20%

• Recommended: Top up allowed at 40%–50% SOC; frequent shallow charging acceptable

• Caution: No long-term undercharge (<80% consistently); optimal target 80%–90%; avoid 90%–100% unless necessary; unplug promptly after full charge

Reasons & Key Notes

1. High-voltage loss control: 90%–100% SOC → intensified electrode side reactions; limit upper charge limit to extend life

2. Deep discharge damage: Complete discharge (auto-shutdown) → extremely low cell voltage → significant capacity shrinkage (same as golf cart lithium batteries)

3. Shallow charging vs Undercharging:

1. Shallow charging: Top up at low SOC, stop at 80%–90% (protective)

2. Undercharging: Consistently stop at 60% & long-term low SOC use (damaging)