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Apple Computing Products:
macOS - Notebook Hardware
intermittent Battery messages Good, Normal, Service, Replace
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<blockquote data-quote="pendlewitch" data-source="post: 1477837" data-attributes="member: 214663"><p>Hello,</p><p>Sorry I came to this thread late. There are some very common misunderstandings about recharging batteries. It is generally accepted within the battery industry that Lithium Ion (and/or Polymer) batteries benefit from shorter charging periods and do not need to be fully charged. </p><p></p><p>The crude rule of thumb is that a charge/discharge cycle is the sum of all those partial charges from depths of discharge which add up to the notional 100% full charge..so a charge from 90% is only 10% and one from 60 % is 40% and so on.</p><p></p><p>The shorter the Depth of Discharge (DoD) the longer the battery will last because it is less stressful and exhibits a lightness of use rather than maxxing out the cells out and whacking them with a hefty charge. Partial discharge on Li-ion is no problem as there is no memory and the battery does not need periodic full discharge cycles to prolong life, other than to calibrate the fuel gauge on a smart battery(e.g. MBP) occasionally. </p><p></p><p>So the interesting thing is that the number of discharge cycles achievable when charging frequently from, for example, a 10 % DoD is approximately 10 times that of charging from 100% DoD. </p><p></p><p>This just isn't practical for most people but if you could charge from 50% DoD on a regular basis you could expect 3 times (1200 to 1500) the number of discharge/charge cycles from your battery as opposed to charging from 100% DoD (300 to 500).</p></blockquote><p></p>
[QUOTE="pendlewitch, post: 1477837, member: 214663"] Hello, Sorry I came to this thread late. There are some very common misunderstandings about recharging batteries. It is generally accepted within the battery industry that Lithium Ion (and/or Polymer) batteries benefit from shorter charging periods and do not need to be fully charged. The crude rule of thumb is that a charge/discharge cycle is the sum of all those partial charges from depths of discharge which add up to the notional 100% full charge..so a charge from 90% is only 10% and one from 60 % is 40% and so on. The shorter the Depth of Discharge (DoD) the longer the battery will last because it is less stressful and exhibits a lightness of use rather than maxxing out the cells out and whacking them with a hefty charge. Partial discharge on Li-ion is no problem as there is no memory and the battery does not need periodic full discharge cycles to prolong life, other than to calibrate the fuel gauge on a smart battery(e.g. MBP) occasionally. So the interesting thing is that the number of discharge cycles achievable when charging frequently from, for example, a 10 % DoD is approximately 10 times that of charging from 100% DoD. This just isn't practical for most people but if you could charge from 50% DoD on a regular basis you could expect 3 times (1200 to 1500) the number of discharge/charge cycles from your battery as opposed to charging from 100% DoD (300 to 500). [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
intermittent Battery messages Good, Normal, Service, Replace
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