07-12-2012, 04:13 AM | #136 |
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They're not user-replaceable batteries, but battery replacement is a same-day service at any Apple Store - £99 inc. VAT here in UK, all-in. FWIW my teenage daughter has a 2009 'last-of-the-line' shiny white unibody MacBook with a fixed battery, and it's holding up just fine on the original battery after the best part of three years, and she's not the most careful of users
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07-12-2012, 04:22 AM | #137 |
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Good question, Harry. My old MacBook had a removable access cover on the back so I could remove/replace battery myself. My current MacBook Pro doesn't, as I was just chagrined to notice for the first time. The Mac models with built-in batteries can have their batteries replaced at an authorized service provider. For more info see: http://support.apple.com/kb/HT3371
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07-12-2012, 04:27 AM | #138 | |
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Wow, those white MacBooks sure seem popular |
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07-12-2012, 04:32 AM | #139 |
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A lithium-ion battery will typically have lost around half of its original capacity after 5 years. They "age" with time, no matter how carefully you look after the battery.
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07-12-2012, 04:41 AM | #140 | |
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Edit: I'm not sure if plugged into power or not matters much in delaying battery replacement, now that I think about it. Last edited by unboggling; 07-12-2012 at 04:50 AM. |
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07-12-2012, 04:44 AM | #141 | |
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1. The number of charge cycles it's gone through. 2. The age of the battery. The two are independent, but cumulative. As far as #2 goes, the "clock starts ticking" the first time that the battery is charged after manufacture, and it can't be stopped. |
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07-12-2012, 04:55 AM | #142 | ||
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Last edited by unboggling; 07-12-2012 at 05:45 AM. |
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07-12-2012, 06:15 AM | #143 |
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That's right. The "% charged" is showing you the percentage of its current capacity, but the "usage time" that being 100% charged gives you will gradually fall as the years go by. And sooner or later the battery will just die.
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07-12-2012, 07:45 AM | #144 |
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I won't pretend to understand the full details of batteries, but from what I've read in passing over the last few years, it sounds like heat and the voltage you charge to are big factors in battery life.
Supposedly for modern batteries the best way to lengthen their life is to not fully charge them. Some laptops allow you to set the bios to cut off charging at around 70-80% of capacity. Obviously if you're off on a trip, top it off first The battery on my main laptop used to last between 2-3 hours, I now get (4 years later) around 20 minutes out of it. Shame I didn't know about keeping it at 100% not been the best of ideas Still I very rarely use it away from the mains, so that 20 mins is great, it's a little UPS :P edit: couldn't find any of the original articles I read it in, but here's a post which covers roughly the same info http://www.cultofmac.com/147994/gett...t-i-os-x-tips/ edit2: I wish every company would make batteries replaceable, ideally user replaceable, but even if getting the casing off the laptop and undoing dozens of screws is required, as long as the battery itself is not soldered or glued to the board I'd be happy. Last edited by JoeD; 07-12-2012 at 07:57 AM. |
07-12-2012, 08:29 AM | #145 | |
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Interesting.
To determine what max cycle count is on Mac portables, and cycles used, see http://support.apple.com/kb/HT1519 For 16 month old 17" MB Pro, max cycle count is 1000, mine is at 2. For 05 year old 13" MB, max cycle count is 300, mine is at 3. Edit: Quote:
Last edited by unboggling; 07-12-2012 at 08:38 AM. |
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07-12-2012, 08:47 AM | #146 |
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07-12-2012, 08:50 AM | #147 | |
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http://www.apple.com/batteries/notebooks.html |
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07-12-2012, 09:18 AM | #148 | ||
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Last edited by unboggling; 07-12-2012 at 09:24 AM. |
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07-12-2012, 12:24 PM | #149 | |
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1. The number of charge cycles is useful for NiMH batteries but not so much for Lithium Ion as Lithium Ion supports topping off. It can be topped off with almost no penalty in charge cycles. As a rule of thumb if you top off with a 10% charge it only counts as a 10% recharge instead of counting like a full recharge as it would if it were NiMH. It becomes good practice to keep your battery topped off. 2. The age of the battery is not a fixed amount beginning with the manufacture. Most manufacturers ship a battery that is not fully charged, generally about 40% charge as the storage life is increased under this condition and can take more variation in temperature cycles that may be encounter is shipping and storage. This is why you are told to fully charge a battery when you get it. Unless the battery has been stored a really long time you can begin counting time when you first charge the battery. As battery technology evolves even the above guidelines will become obsolete. |
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07-14-2012, 03:40 PM | #150 | |
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