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Ask HN: Should I unplug my laptop charger at 100%?

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Re: Ask HN: Should I unplug my laptop charger at 100%?

#31
post #17

You should have talked to Google, instead of numerous people. http://batteryuniversity.com/learn/article/how_to_prolong_li... Summary: Similar to a mechanical device that wears out faster with heavy use, so also does the depth of discharge (DoD) determine the cycle count. The shorter the discharge (low DoD), the longer the battery will last. If at all possible, avoid full discharges and charge the battery more often…

Finally, a citation, thank you.

Re: Ask HN: Should I unplug my laptop charger at 100%?

#32
post #5
post #3

AFAIK only macbooks have been designed to bypass battery ( once the charge is 100% ) and directly run on connected power. For other notebooks its best to unplug charger at 100% and connect charger at around 10% to get a longer lifetime of the battery.

Not 10%! That's terrible for a Lithium battery. Charge it when it gets to 40%.

Actually it has been lab-determined that batteries should be charged once they hit 60%.

http://batteryuniversity.com/learn/article/how_to_prolong_li...

Re: Ask HN: Should I unplug my laptop charger at 100%?

#33
Leaving it plugged in has the same effect as removing the battery while it's plugged in (and putting the battery in identical thermal conditions). (Just think: if it were bad, engineering a workaround would be simple.) It's fine to have the battery sit at 100% for short periods of time. The damage you get around the 100% number is from charging/discharging to/from 100%, or leaving it unused for long periods of time.

Re: Ask HN: Should I unplug my laptop charger at 100%?

#35

You could remove the battery when its charged and stay on the cord. Because battery life is heat-related. And leaving a charged battery in the laptop when you have a cord is chewing up lifetime without benefit.

This is exactly what I do. When I am plugged in to a desk and do not intend to move for longer than 3 hours, i take the battery out.

Re: Ask HN: Should I unplug my laptop charger at 100%?

#37

You could remove the battery when its charged and stay on the cord. Because battery life is heat-related. And leaving a charged battery in the laptop when you have a cord is chewing up lifetime without benefit.

For maximum effect, remove it at 40-70% and store the removed battery in the fridge.

Re: Ask HN: Should I unplug my laptop charger at 100%?

#38
post #17

You should have talked to Google, instead of numerous people. http://batteryuniversity.com/learn/article/how_to_prolong_li... Summary: Similar to a mechanical device that wears out faster with heavy use, so also does the depth of discharge (DoD) determine the cycle count. The shorter the discharge (low DoD), the longer the battery will last. If at all possible, avoid full discharges and charge the battery more often…

My understanding (again, uncited, like almost everything in these threads) is that one might /perceive/ a different result than this because the /software/ calibrates what 0 and 100% mean based on observation.

If you never observe a zero (or, presumably, a 100%), it might recalibrate incorrectly. Again, this is based on old and uncited knowledge. There's surely someone here involved in writing power management software that could chime in.

Re: Ask HN: Should I unplug my laptop charger at 100%?

#40
i used to have a macbook that i used as a desktop in clamshell mode. i left it plugged in all the time. i never took it anywhere.

when i called apple to replace the battery on warranty because it had started to bulge/swell dangerously and not hold charge, they had me open up the system information panel to see how many cycles it had been through, and it was hilariously low, like, 4. they refused to warranty it.

so at the very least, if you care at all about your warranty coverage, you should probably cycle it normally.

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