Formal term: Charging/discharging cycle; Common shorthand: Charging cycle. Definition: Full energy loop (charge → rest → discharge → rest), emphasizing "charge + discharge" closed-loop nature.
How a Cycle Is Counted
Core rule: 100% total discharged capacity + charging.
Lithium battery cycle life test: Full charge-discharge under specific protocols. Practical counting: Sum of discharged energy = 100% rated capacity → 1 cycle complete.
Why Charging Is Required (Basics)
Discharging alone (e.g., 100%→0%) only depletes energy, no closed cycle. Full cycle needs: Recharge to replenish → discharge again until total discharged capacity hits 100%.
|
Scenario |
Result |
|
100%→20% (80% discharged) → charge back to 80% |
Partial discharge + partial charge; not a cycle |
|
Then 80%→60% (20% more discharged); total 100% |
1 full cycle complete (core: total discharged capacity; charging refuels to close loop) |
Note
Interrupted charging (resumed later, no discharge in between): Not a cycle; minimal battery impact.