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<blockquote data-quote="MacInWin" data-source="post: 1617212"><p>Let me add to the battery discussion. LiIon batteries' life is measured in "cycles." A cycle is defined as fully flat to fully charged to fully flat. After a certain number of these, the battery starts to show decay in that it won't get to the same charge level, meaning it's useful time is slightly reduced. But LiIon batteries also decay with time, no matter how gently they are used. The decay starts about 24 months after manufacture (note, manufacture, not service or use). The decay is very slight, but increases over time. Cycles are also "fractional" to an extent. In other words, if you let the battery go from 100% to 50% and then recharge back to 100%, that's a half cycle. Theoretically you can add all these fractions to get the total load cycles of the battery, but it's not totally linear. You can get more that four times quarter cycles that full cycles, for example, because quarter cycles are "gentle" to the battery.</p><p></p><p>For example in my 2011 MBP I'm using right now, the original battery, rated at 8450mAh, now has a maximum charge of 8078mAh, or about 95.5% of original specs. CoconutBatttery reports that the battery has 54 full cycles on it during the 1328 days it has been in service. As you can see, I don't use the battery very hard. Most of the time my MBP sits on my desk, plugged into mains power, with the battery topped off, which is why it only has 54 full cycles. But if you do as you are doing, removing the battery, you aren't adding to the longevity. The circuitry in the MBP is designed to feed a trickle charge to the battery and to measure it's health. Removing it from the machine means the battery is no longer getting that trickle and sustainment, which means when you put it back in, it's actually going to be LOWER in strength that it would have been if you left it in.</p><p></p><p>Apple suggest a full discharge once a month. But that recommendation is not for battery health, but to allow the battery circuit to recalibrate the battery capacity so that the % or time remaining it shows is more accurate.</p><p></p><p>So, leave the battery in, leave the machine plugged in as much as you can and avoid deep discharges. The battery may well outlast your MBP that way.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1617212"] Let me add to the battery discussion. LiIon batteries' life is measured in "cycles." A cycle is defined as fully flat to fully charged to fully flat. After a certain number of these, the battery starts to show decay in that it won't get to the same charge level, meaning it's useful time is slightly reduced. But LiIon batteries also decay with time, no matter how gently they are used. The decay starts about 24 months after manufacture (note, manufacture, not service or use). The decay is very slight, but increases over time. Cycles are also "fractional" to an extent. In other words, if you let the battery go from 100% to 50% and then recharge back to 100%, that's a half cycle. Theoretically you can add all these fractions to get the total load cycles of the battery, but it's not totally linear. You can get more that four times quarter cycles that full cycles, for example, because quarter cycles are "gentle" to the battery. For example in my 2011 MBP I'm using right now, the original battery, rated at 8450mAh, now has a maximum charge of 8078mAh, or about 95.5% of original specs. CoconutBatttery reports that the battery has 54 full cycles on it during the 1328 days it has been in service. As you can see, I don't use the battery very hard. Most of the time my MBP sits on my desk, plugged into mains power, with the battery topped off, which is why it only has 54 full cycles. But if you do as you are doing, removing the battery, you aren't adding to the longevity. The circuitry in the MBP is designed to feed a trickle charge to the battery and to measure it's health. Removing it from the machine means the battery is no longer getting that trickle and sustainment, which means when you put it back in, it's actually going to be LOWER in strength that it would have been if you left it in. Apple suggest a full discharge once a month. But that recommendation is not for battery health, but to allow the battery circuit to recalibrate the battery capacity so that the % or time remaining it shows is more accurate. So, leave the battery in, leave the machine plugged in as much as you can and avoid deep discharges. The battery may well outlast your MBP that way. [/QUOTE]
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