[egypturnash]

From the referenced tweet thread about someone finding this out for the first time:

In other news I updated my phone to iOS 15 and put it down to charge last night. When I woke up it was hot, and my battery has gone from 100% to 15% since 7:30am. I gotta get off this ecosystem.

"My phone's battery life has suddenly become much worse" sure sounds like a major impact to me.

[SilverRed]

That has nothing to do with this change. It doesn't even seem like they had their phone turned off for this to be in play anyway. The most likely answer is that they hit a bug in the new update or that they placed their phone off centered on a wireless charger. I'm not sure why the general public should care about rare bugs in day one updates which get patched pretty quick anyway.

The turned off pings use an ultra low power mode similar to the airtags which should last months on a "flat" battery.

[AuthorizedCust]

> … placed their phone off centered on a wireless charger.

No. The phone got charged. That’s made clear in the quote. Something is draining it post-charge.

[AlphaSite]

IIRC after an update your phone starts to reindex everything so for a short while battery is impacted.