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There are many suggestions about lithium ion battery:

  1. Prevent over-discharging. Cell reversal can cause an electrical short.

  2. It is good for the battery to be completely discharged every so often, about once a month.

  3. Q: Should I totally discharge, then recharge my Dell laptop battery occasionally to make it last longer? A:No, discharging and charging does not increase the life of a Lithium Ion technology battery.(Dell FAQ)

  4. To use a laptop on battery or AC adapter, it won't make all that much difference. What will shorten battery life is temperature.

  5. Most users do not remove the AC power and I like to believe that this practice is safe.

  6. Battery should be periodically charged and discharged between 20%-100%, it will extend battery life.

  7. Depth in cycle decreases capacity.


     Depth of discharge(DoD)                     Discharge cycles
    --------------------------------------------------------------
     100% DoD                                    500
    --------------------------------------------------------------
     50% DoD                                     1500
    --------------------------------------------------------------
     25% DoD                                     2500
    --------------------------------------------------------------
     10% DoD                                     4700
    --------------------------------------------------------------
    

If I can keep the temperature at desired level, what about the conflicting suggestions (e.g. 5 vs 6) mentioned above????

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Are you sure #6 is about the actual capacity of the battery, and not just for calibration of the amount of charge remaining? –  sep332 May 3 '13 at 14:04
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marked as duplicate by Brad Patton, Karan, 8088, Tog, Renan May 4 '13 at 23:39

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1 Answer

"Lithium Ion" is actually a broad family of battery technologies. That said, they all break down due to currents. This means discharge/charge cycles only hasten the demise. In comparison, charging lead-acid batteries may break up lead-sulfur deposits. That's why they do benefit from a discharge/charge cycle.

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