With such drastic performance decreases on a previous generation Macbook Pro, it doesn’t seem logical to remove the battery when a brand new battery can be purchased for $129 from Apple (opens in new tab) or possibly even less from other resellers.
If your use is infrequent, it is recommended that the battery be completely discharged and recharged once per month.
Standard maintenance is not to constantly keep the battery charged but rather allow it to discharge partially before recharging it again. Apple recommends that with notebook batteries, occasional power flow is necessary for its longevity. The only benefit in operating a notebook without its battery is to conserve charge cycles and thereby extending the battery life. What does Apple have to say about this? The official statement from its support document is that “It is strongly recommended that you do not use your MacBook or MacBook Pro while the battery is removed.” Our own tests show a decrease of 50 percent when rendering with one CPU, a decrease of 52 percent in multiprocessor rendering, while the GPU suffered a 40 percent decrease in performance. Gearlog’s own results show a decrease of 36 percent in processor speeds without a battery attached on their unibody MacBook Pro. MacBook Pro performance with battery on left performance without battery on right.
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