Smartphone/tablet batteries & Laptop batteries

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Does the same rule of "To reduce wear rate & extend battery health, don't discharge your laptop (Li-ion) battery under 20% and don't use the laptop while keeping it plugged in at 100%, instead charge it to 80% and then discharge it to 20% and repeat this always" applies to the smartphone/tablet batteries (Li-ion/Li-polymer) too?
 
Solution
I typically charge my Android phone to 100% because it is my primary phone and I recharge it when it gets to 40% or below. I do on occasion allow it to drain down to 0% when I know I will not be going out and allow it to fully recharge.
The answer is yes.

I have drained the lithium ion batteries down to 0% with no ill effect. The general recommendation is not to allow the battery to go below 3% because the charge is so low that the battery never "wakes up" again even if you charge it for days. That probably is true of older lithium ion battery tech, but I never heard of that happening with current lithium ion batteries, but that does not mean it will not happen.

When a lithium ion battery is near it's max capacity that stored electrical charge causes a chemical reaction where lithium ions start clumping together known as lithium ion plating. When this happens the lithium can no longer hold a charge and the battery life starts to decrease. This is why many modern laptops only allow the battery to charge to 60% - 80% unless you manually override it.
 
I typically charge my Android phone to 100% because it is my primary phone and I recharge it when it gets to 40% or below. I do on occasion allow it to drain down to 0% when I know I will not be going out and allow it to fully recharge.
 
Solution