It depends on the particular battery, but most MacBook batteries are sold around $30.
That all depends on which macbook where you buy it and where you live.
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The New Apple Macbook contains up to 12 Hours of Battery life on the 13 inch Macbook and up to 9 hours on the 11 inch Macbook. From the Apple site, the 11 Inch Macbook with 128gb is currently AU$1,099.00 and the 11 inch with 256gb is AU$1,349.00. The 13 inch Macbook with 128gb is AU$1,249.00 and the 13 inch with 256gb is AU$1,449.00. This also includes free shipping.
If the battery of your MacBook is fully charged whilst you have the power cable plugged in, then the MacBook will switch to battery power instead of wasting electrical power from the plug. Once the battery is run down again, the Macbook will switch back to electrical power from the plug.
If you have a new macbook pro with the metal body case, no. If you have an older macbook pro, you can use a coin to turn the lock on the bottom of the laptop to remove the battery.
If your battery is dead and you connect the power supply with your battery installed, the battery will automatically start charging. If you wish to run your MacBook off your power supply only, simply remove your battery from your MacBook and connect the power supply. You will then be running solely on the power supply. If you battery becomes fully charged while your power supply is connected, you MacBook will switch to the power connector as it's power source - preserving the battery.
The cost for a good battery will run close to $100.00
The smallest mac (mac mini) costs about $599. However the Macbooks and Macbook Pros cost from about $1100 to $2499. The iMacs cost about $1499. The MacPros cost $2799.
10 hours.
A lithium battery cr2032 battery does not really cost that much. You should be able to find these batteries in the store for $3 or $4 tops.
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The Apple Macbook pro is the newest. This Apple Macbook cost 855 dollars.