2 years, 1 month ago
via macbookanswers.com
Will removing the battery from my Macbook and using the wall charger extend the life of the battery?
I use my Macbook indoors on a regular basis. I wonder if I would be better off to remove the battery and just stick with the wall charger as a power source. Other people have told me that using a Macbook while plugged into the wall, with the battery in will burn up the battery. I have also heard that fully recharging the battery on regular basis is harmful as well. Even though I don’t to use the battery while indoors, I want to extend it’s life the best of it’s ability. There seems to be some controversy as to what Apple suggests for Mac laptop users from my online search.
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M$1 Answer
Your battery life is essentially based on the depth of discharge you allow the battery to go down to, and how many cycles of charge/discharge it goes through. For minimal discharge (say under 10% depth-of-discharge, you may be able to recharge-discharge-recharge-etc. tens of thousands of times. If you discharge it almost all the way, that number drops to perhaps a few hundred to a few thousand times at most. The drop is more than the 10-fold you'd expect from going 10% down to going near 100% down. Keeping the laptop plugged in as much as possible, and minimizing use while on battery power only is what will extend your battery life most. You could do as you propose, which will essentially be the same as keeping your laptop turned off, as far as your battery is concerned, but this is not necessary. It also removes the battery from the circuit so to speak, which makes you computer more susceptible to surge-damage. Your best bet is thus to leave the battery in, and the wall-jack plugged in as much as possible.
By the way, the "memory" problem people refer to that caused issues when you discharged a battery only a bit and then recharged it was true for NiMH batteries, but is not the case for Li-ion batteries.
By the way, the "memory" problem people refer to that caused issues when you discharged a battery only a bit and then recharged it was true for NiMH batteries, but is not the case for Li-ion batteries.
source(s):
Experience with Li-ion batteries.
Experience with Li-ion batteries.
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