Questions & Answers for Rechargeable Battery - 17-inch MacBook Pro

To calibrate the battery:

Plug in the MagSafe power adapter and fully charge the MacBook or MacBook Pro battery until the light on the MagSafe connector changes to green and the Battery icon in the menu bar indicates that the battery is fully charged.

Allow the battery to rest in the fully charged state for two hours or longer. You may use your computer during this time as long as the power adapter is plugged in.

Disconnect the power adapter with the computer on and start using it with battery power. When the battery’s charge gets low, you’ll see the low battery warning dialog on the screen.

Continue to keep your computer turned on until it goes to sleep. Save your work and close all applications when the battery’s charge gets low and before the computer goes to sleep.

Turn off the computer or allow it to sleep for five hours or longer.

Reconnect thepower adapter and leave it connected until the battery is fully charged. You may use your computer during this time.

• Answered by Kevin B from Greeley
• 11 1, 09
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There is no simple answer to your question, unfortunately. Lithium batteries have a naturally decaying capacity, as the battery forms deposits in the reactants that decrease battery capacity and longevity. A number of things will accelerate this, and keeping the battery at full charge is one of those things, so you should use your battery. At the same time, lithium batteries do not handle "deep discharge" or high current draw as well as other chemistries—like NiMH (nickel-metal hydride) or NiCad (nickel-cadmium)—and as a result it is a good idea to be connected to AC power when asking the computer to do anything power intensive.

It's worth reading Apple's recommendations for caring for laptop batteries (go to Apple.com and add /batteries/notebooks.html to the URL or search for it, as I am unable to post a link). In short: Ideally you'll use the battery part of the time and AC power part of the time. If you leave it plugged-in for long periods of time, you should cycle the battery once a month. And if you're storing the battery for 6 months or more, you should store it at about 50% state of charge.

Hope that helps.

• Answered by Nicholas H from Plano
• 09 9, 10
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1-year on the battery that comes with a new laptop and 90 days on a replacement if not defective.

• Answered by Bill M from Lagrange
• 01 20, 10
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Just plug in your ac adapter and use the computer. Ensure the battery if fully charged before using it on battery power and let it drain all the way down before the next charge. From then on, use the battery about once a week till it is all the way down and you are getting those "Save your work now" messages" and let it charge all the way up again. You can use the computer while it is charging. All of this is from the a recent Genius Bar appointment where they told me my battery was failing for lack of use and that it had a very low number of cycles on it and that was not good for it.

• Answered by Jeffery S from Denton
• 10 11, 10
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I found below opinion from a apple-forum. It might help you.

MA348LL/A and A1175 are the same thing. MA348LL/A is the Apple part number (aka order number), A1175 is the Model Number of the battery. So, if you order MA348LL/A and actually look at the printing on the battery, you'll see Model A1175 on there.

If you're referring to the batteries available on Amazon, check one of the reviews for the less expensive A1175 item:

When they say 'original' Apple laptop battery they mean that literally. The battery I received had a serial number ending in U7SB - one of the orginal MacBook Pro battery packs manufactured between February 2006 and May 2006. These batteries were found to be defective and are subject to an Apple product recall. Fortunately, with some persuasion, I was able to convince the local Apple store to exchange the battery pack for an updated one. The Apple battery recall website will not validate you for an exchange unless you have a MacBook Pro with an early serial number.

One of the risks of buying batteries from 3rd party vendors is getting old stock. For some things (e.g. a power adapter) that's not much of an issue. But lithium-based batteries have a useful life of 400-500 charge cycles or 3-4 years - whichever comes first. Shelf life counts against that time - there's a continuous chemical reaction occurring in the battery, and buildup of oxidation products - and the latter is actually worse if the battery is not being used. So, if you buy a battery that was made 2 years ago, you can expect to get 1-2 years of use from it (probably closer to 1), not 3-4.

My advice - get the more expensive one, or even pay the extra $10 and buy direct from Apple (it's not necessarily $10 more, since Apple offers free shipping and the 3d party vendors on Amazon who charge less than Apple may charge for shipping).

Hope this helps...

• Answered by Yongjin P from Chicago
• 01 28, 10
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In short, Yes, this battery will replace a battery No. A1175.

This is from another apple forum:

MA348LL/A and A1175 are the same thing. MA348LL/A is the Apple part number (aka order number), A1175 is the Model Number of the battery. So, if you order MA348LL/A and actually look at the printing on the battery, you'll see Model A1175 on there.

• Answered by Scott M from New York
• 02 21, 12
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