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SL failed my battery status!

I bought a used Macbook 2.1 GHz with Leopard (10.5). Battery condition was good, according to the About My Mac Information button. I couldn't complain about battery endurance when I was using it. Wanting to get a more current OS, I formatted the drive and did a clean install of Snow Leopard. Battery performance is still unchanged, but now I get a Replace Battery when I look up battery condition. Why the change? Is 10.6 more demanding on battery life?

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Download and run Coconut Battery and let us know your results: http://www.coconut-flavour.com

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Coconut battery says my battery has 138 cycles, design capacity of 5020 maH, and current capacity of 2988 maH. That's 60% capacity compared to new. That's not too bad, yet SL says to Service the Battery!

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I'd pull the battery and inspect for corrosion on the contact and see if it is swelling

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Nope, no corrosion on the contacts.

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I did an SMC reset (removed battery), pressed power button 7 seconds, waited 5 minutes, then reinstalled battery). After powering up, coconutbattery now says battery capacity is 4434 maH, and is 88% of the original 5020 maH design capacity. On checking battery condition, the Service Battery notice is gone, and is now back to a Normal Condition tag !!

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