running T420 laptop off mains

maumau

maumau

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does it damage the battery to keep a lenovo T420 plugged into the mains? or best to charge, uplug until the battery runs out and recharge? tks
 
If you're connected to mains often i.e. desktop replacement then you should run without the battery connected. Working while charging is fine.
 
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

TLDR:

The question is often asked: Should I disconnect my laptop from the power grid when not in use? Under normal circumstances this should not be necessary because once the lithium-ion battery is full, a correctly functioning charger will discontinue the charge and will only engage when the battery voltage drops to a low level. Most users do not remove the AC power, and I like to believe that this practice is safe.
Click to expand...
 
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