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Changes to Step #13

Edit by Jeff Suovanen

Edit approved by Jeff Suovanen

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[* black] Next, let's zoom in on that battery board. The two pins on the output connector show 3V, which suggests these are probably CMOS batteries wired in parallelparallel. But why two of them? And why the strange placement in the middle of the enclosure?
[* black] Ordinarily, we'd expect to find a single CR2032 battery protecting the NVRAM, like on [guide|92170|previous iMacs|stepid=172309].
[* black] '''Best guess''': The new iMac design was ''too thin'' for a CR2032 on the main board. That's right—they couldn't squeeze in the battery [link|https://www.ifixit.com/News/50145/airtag-teardown-part-one-yeah-this-tracks|from an AirTag]. So Apple instead used two half-height CR2016s, and squirreled them away over here
for redundancyclearance.
[* black] Closer inspection reveals a camouflaged stretch-release adhesive pull tab—thetab under the battery board—the same sort of stuff that [guide|138640|secures iPhone batteries|stepid=275966].
[* icon_note] We're fans of this stretchy adhesive when the alternative is poking and prying at a glued-down smartphone battery, but its use here isseems ... odd. Apple must want service techs to swap the board—with both batteries at once—but why?
[* black] Swapping screws for the solder on the metal battery covers,Once again, thinness suggests an answer: This is a wafer-thin board, set in place with a vanishingly thin strip of adhesive.
[* icon_reminder] You can't fully remove
or simply letting the CR2016 batteries slide out from the covers (impossible withreplace either battery while the board installed) seems obviously superior to usis glued in place. Fortunately replacements shouldn't be frequent, but they'll certainly be inconvenient.
[* black] Next, let's zoom in on that battery board. The two pins on the output connector show 3V, which suggests these are probably CMOS batteries wired in parallelparallel. But why two of them? And why the strange placement in the middle of the enclosure?
[* black] Ordinarily, we'd expect to find a single CR2032 battery protecting the NVRAM, like on [guide|92170|previous iMacs|stepid=172309].
[* black] '''Best guess''': The new iMac design was ''too thin'' for a CR2032 on the main board. That's right—they couldn't squeeze in the battery [link|https://www.ifixit.com/News/50145/airtag-teardown-part-one-yeah-this-tracks|from an AirTag]. So Apple instead used two half-height CR2016s, and squirreled them away over here
for redundancyclearance.
[* black] Closer inspection reveals a camouflaged stretch-release adhesive pull tab—thetab under the battery board—the same sort of stuff that [guide|138640|secures iPhone batteries|stepid=275966].
[* icon_note] We're fans of this stretchy adhesive when the alternative is poking and prying at a glued-down smartphone battery, but its use here isseems ... odd. Apple must want service techs to swap the board—with both batteries at once—but why?
[* black] Swapping screws for the solder on the metal battery covers,Once again, thinness suggests an answer: This is a wafer-thin board, set in place with a vanishingly thin strip of adhesive.
[* icon_reminder] You can't fully remove
or simply letting the CR2016 batteries slide out from the covers (impossible withreplace either battery while the board installed) seems obviously superior to usis glued in place. Fortunately replacements shouldn't be frequent, but they'll certainly be inconvenient.