Extend the battery life??

As i know the battery of the new macbook pro 13 can last for 7 hrs, that is 40 percent more than the previous macbook 13 aluminum. I just wanna ask the life of the battery is based on the whole battery itself or the whole macbook?? I am using the old macbook 13 aluminum 2.4Ghz, can i buy an extra battery that is what the new macbook pro 13 using?? can the battery of my macbook 13 aluminum last for 7 hrs that is the same as the new macbook pro 13?
Thanks!
Austin

Hi, qwqw
the "lifetime" depends on two parameters: how much power the battery can store, and how much power the computer needs. the first is calculated in "Ampere*hours" (assuming tacitly a given voltage). The computer, evidently, uses a current measured in Amperes over a number of hours. Note that a computer doesn't use a fixed current, but the power it needs depends on the work he does: if there is a lot of graphics, then he is running hot, since he uses lot of power.
your question boils down to :
a) is the battery of the MB-pro compatible with the MB-alu;
b) is the battery of the MB-pro better than the one of BM-alu .
if both answers a "yes" then it makes sense to buy a MB-pro battery and to put it into the MB-alu.
My guts feeling tells me that - if the batteries were different, but compatible - Apple would offer the better battery, since a longer autonomy time is a prime selling argument. since they don't do it, i guess they have a good reason for this.
Hope this helps
Thomas

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    02-May-200701:14 PM
    bixby wrote:
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    dont change the post content as the title is 'How to increase the battery life of your N series device'
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    Web Address (URL):
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    Sorry this is a user to user technical forum.  There is NO APPLE here as stated in the term of use when you signed up for this forum.
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    Internal damage from fall or loose connector. Take it to
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