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After having returned my original Macbook Pro battery (made by Sony) and receiving my new SMP made lithium-polymer battery unit, my “at rest” macbook pro battery life reads 5 hours 25 minutes upon fresh unplugging.

How long does your new Macbook Pro battery last?

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If you’ve noticed that your Macbook or Macbook Pro purchased in 2006 or 2007 is losing its battery life at an alarming rate, you’re not alone. Apple has had a very large batch of Sony lithium-ion polymer batteries for their laptops that are losing their maximum charge capacity very quickly.

System Profiler - Power

If you’ve noticed that your 4 hour battery life dropping to just over 2 hours recently, check your System Profiler for some information about your laptop battery power system.

System Profile can be found in Finder => Applications => Utilities => System Profiler.

Once you have System Profiler open, find Power underneath Hardware. Click on that item and on the right side of the window, scroll down until you find the Battery Information heading.

The three values we’re interested in are Full charge capacity (mAh), Cycle count, and Battery health.

A normal reading for Full charge capacity is about 5200-5400 mAh (milliamp hours). That translates into just over 4 hours battery life. Cycle count is how many times the battery has been used to capacity and recharged. Battery health is a word describing overall life expectancy and condition of the battery.

Remember that Apple has published on its Apple Support site that their laptop batteries are designed to hold 80% of its original charge capacity after 300 cycles (see the footnotes).

Doing the math, that means the Full charge capacity should be around 4160 to 4320 mAh after 300 cycles. If your Macbook battery is failing, like mine, it should read less than 3250 mAh, with a Health of “Fair” after far less than 300 cycles.

But, don’t despair. With that juicy price paid for the best laptop available on the market comes pretty good customer service. Bring your Macbook into an authorized service center, an Apple flagship store, or call up Apple support hotline and explain the situation. Also note that there are several support forum threads on Apple.com about users describing the same situation and what Apple has done for them:

http://discussions.apple.com/thread.jspa?threadID=1227431&tstart=0

http://discussions.apple.com/thread.jspa?threadID=1300374&tstart=0

For Macbook users experience battery life problems as described above the warranty coverage is being extended to two years, so even if your Macbook is out of warranty, your battery may still be in warranty.

I currently have a battery being sent to me and we’ll see how things turn out.

Good luck.