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I want to install additional RAM to my early 2011 MacBook Pro.

I originally was only looking at the official Apple guide, but then while searching for a better screwdriver I found the iFixit guide, which tells you to disconnect the battery.

Is this necessary? Apple's guide doesn't mention it.

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up vote 1 down vote accepted

I just did it without disconnecting the battery and it works fine, so disconnecting the battery is not needed.

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In case your computer is really shut down it's not necessary since memory is not powered.

I believe ifixit instruction tend to be on safe side: for example this one is just to be sure that memory is really not powered and computer not just in sleep mode accidentally.

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