laptop - Prolonging Lithium-ion battery life: what should I do?

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????