Is my battery health ok?
My macbook is now 2-3 years old and has 40 cycles buy my battery health is 90%!Is this ok or i need to replace?
1.8 GHz デュアルコア Intel Core i5（Turbo Boost使用時最大2.8 GHz）3MB L3キャッシュ
If you've only had 40 charge cycles, your battery is completely fine. Apple claims that MacBook Air batteries are "...designed to deliver up to 1000 full charge and discharge cycles before it reaches 80 percent of its original capacity."
Your battery at 90% looks fine but just to be sure, download and run Coconut Battery as Buco said. Here's where to get it: http://www.coconut-flavour.com/coconutba...
These batteries usually last 5-6 years before they need replacing and can run upwards of 600+ cycles.
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