Leaving Your Laptop Always Plugged In Will Kill Its Battery Faster
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Posted September 28, 2013 at 4:18pm by iClarified
Leaving your laptop always plugged in will kill its battery life faster, according to a recent report from Wired. In fact, you shouldn't even let it charge to 100%.
Cadex Electronics CEO Isidor Buchmann tells the site that ideally users would charge their laptops to 80% and then drain them to 40%, prolonging their battery life by up to 4x.
The reason is that each cell in a lithium-polymer battery is charged to a voltage level. The higher the charge percentage, the higher the voltage level. The more voltage a cell has to store, the more stress it’s put under. That stress leads to fewer discharge cycles. For example, Battery University states that a battery charged to 100 percent will have only 300-500 discharge cycles, while a battery charged to 70 percent will get 1,200-2,000 discharge cycles.
This is simple in theory but much harder in practice. The report suggests timing how long it takes your device to charge from 40% to 80% and then setting a timer when you first plug your laptop in to charge.
If you can remember to follow Buchmann's advice, a four times increase in battery life is a significant improvement.
what a funny and misleading information.
if the battery life time is 400 to 500 charging cycle, and let the battery last for 10hours, that mean the battery will work 4000 to 5000 hours, if discharged fully and then charged fully.
with the information in this study, if we charge upto 70% and discharge upto 40% as suggested, the battery will have 1200 to 2000 cycles. so for 3hours of usages times, then the battery will have 3600 to 6000 working hours. what is the difference.
very funny study
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unfortunately, Storing a Lithium Ion battery at 100% charge for long periods reduces battery life as well. If not being used, they should be stored at 50% charge.
Apple already said it has a battery controller that, when battery reaches 100%, it stops charging the batteries and let it go down a little bit then recharges it again. All that to keep the chemicals active abd avoid that crap you posted
I agree ! I let my Macbook Pro all the way to 3% or even 2% then I plug it in.
Been doing that since I bought it
It holds the battery charge almost for 4 Hrs.
this is not completely true, more cycles in your battery will mean less charge and that will drain your battery faster you should recalibrate your battery about once a month but otherwise leave it plugged in when you can that works for me
I believe they mean equivalent full charge cycles. Smaller charges do less damage to the batteries and they last longer.
This makes sense and is the same thing EV car owners have to deal with.
My 3 years old MacBook Pro is on charge cycle 513, health ranges 75% to 80% since about 50 charge cycles. Check battery message popped up since about 200 charge cycles. Lucky to get more than 3 hrs running on battery, doing simple tasks. Whereas my friends' can do around 6hrs with their battery charging habits.
I always treated my MacBook Pro battery with care (discharge regularly and avoid leaving laptop charging at 100% for too long). Had 3 batteries failed prematurely with poor battery health and check battery messages. Whereas 2 of my friends who constantly leaves their MacBook Pros on charge almost permanently, their battery health is no less than 97% after 3 years of use (less than 30 charge cycles). I can use their laptops on battery and lasted much longer than mine (same model and purchased at the same time)
This has been a fact for so long .... Every month let at least once let the battery dried to 0% and dead and fully charge it up to recycle the battery cycle ... That's what i do and mac air 11 late 2011 still goes 4 hrs