How to best preserve unused batter battery of a laptop?

I have a laptop (Asus K52J) which I always use as a “desktop”, i.e. it is always plugged in the power supply, and practically never run on battery. So the, in order to best preserve the battery for those few times when I actually might use the battery, what would be the best:

a)      Keep the battery in the laptop?
b)      Fully charge the battery and remove it from the laptop?
c)      Something else?
npaunAsked:
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Predrag JovicConnect With a Mentor Network EngineerCommented:
c) Battery should be emptied to around 50 % (40 - 60 %) % of full capacity and kept in cold place (like fridge - but must not be too cold). I store my batteries like this and batteries are in excellent condition.
I was asking the same question after my first laptop battery died without almost never being used.

When I plan to travel I take battery from the fridge a day before. :)
Put it somewhere to worm up slowly (usually in some fabric), and then attach to laptop to be charged to full capacity.
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dbruntonCommented:
a)      Keep the battery in the laptop.
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npaunAuthor Commented:
PS: if b) How long before returning to laptop and recharge
Anyway, an argumentation for the suggestion would be prefered...
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dbruntonCommented:
For a) the laptop may be expecting a battery in it to act satisfactorily.  Some laptops demand a battery within and won't work without one, can't comment if yours is one of these or not.

With it in the battery and power supply should act in unison.  Ideally the power supply should be doing all of the work with the battery on hand to top up if required.  It is unlikely that the battery will be called upon but nice to know it is there.  A similar example is in cars with alternator and battery.  The car could run on just alternator alone without any battery, but much better with the battery as backup.

 b) How long before returning to laptop and recharge

Hard to say.  The battery will slowly discharge over a period of time but we are probably talking of month or months.
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rindiCommented:
I agree with discharging it to around 50%, then removing it from the laptop. But I wouldn't go that far and put it in a fridge, I don't have a spare fridge and space in it is limited. A cellar on the other hand is usually cool enough, so I store them there.
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Predrag JovicNetwork EngineerCommented:
I don't have a cellar. :)
My battery is in the plastic box not to corrode .... etc...
Recommended temperature is 0 - 10°C.
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