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17PM here still at 100% health with 184 cycles. I charge nightly to 100% using MagSafe.

I think the keys are partially a battery quality lottery and keeping the phone cool. With the vapor chamber and I don’t use my phone a lot out in the sun it stays cool, which I believe keeps the battery healthy.

The degrading of the battery is also not linear, so my 100% could drop like a rock and then stay at a lower percentage for a long time too.
 
Looking at the Pitaka site , it seems that the new Summa / Ultraguard case for the normal iPhone 18 Pro is thinner and a bit lighter than the iPhone 17 Pro version ... eager to see if I need to get a new Pitaka case or I can reuse my current one for the iPhone 18 Pro
 
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