internal battery, iMac 5K Retina?

[jchuzi]

I'm used to being concerned about the internal backup (PRAM) battery in my old G4 and Mac Pro (I replaced it in both, eventually). I know that Apple claims that, except for memory, there are no user-replaceable parts in my iMac 5K Retina. I am concerned that replacing the battery would necessitate a trip to Apple.

I looked at the listing in MacTracker, and it says (under Connections):

POWER

Backup Battery   --

Since the newest iMac listed with such a battery is the 20-inch Late 2006 model, may I assume that subsequent models do not have it?

MacTracker has the following listing for the above:

POWER

Backup Battery   3 V Lithium (922-6476)
 
If there is no battery in later iMacs, what has Apple done to maintain PRAM settings when the computer is shut down?

[Xairbusdriver]

All those settings are stored in the "cloud". "Please note that you will need an Internet connection (not included with your Mac) and may be charged (no pun intended, of course) for that use." Oh... wait... "Please connect your dead Mac to a functioning model, preferably one of newer vintage. You can find a good, re-furbished model at www.apple-has-you-by-the.org/all-your-base-are-belong.htm"

Seriously, they probably switched to Li-ion batteries. Those never fail! Just ask Boeing!

[jchuzi]

Here's another take on this question: FTM thread