iOS 27 battery life thread.

[goldmac2006]

Those opinions are not going to matter in 2 hours when they release b5. We’re back to square one.

O dang rly? I forgot that they may release it. Thanks for letting me know 😂 I totally forgot about that

 

[Artemiz]

O dang rly? I forgot that they may release it. Thanks for letting me know 😂 I totally forgot about that

It’s already been 15 days, so it’s very likely to be released today, and then weekly releases moving forward.

 

[goldmac2006]

It’s already been 15 days, so it’s very likely to be released today, and then weekly releases moving forward.

On the lookout 👀

 

[Boardiesboi]

iOS 27 PB2 on my 17 PM has been very smooth with little or no issues.

But battery life is noticeably worse than before. The first 10% from 100% to 90% drains much faster than iOS 26.5.2.

 

[FeliApple]

iOS 27 PB2 on my 17 PM has been very smooth with little or no issues.

But battery life is noticeably worse than before. The first 10% from 100% to 90% drains much faster than iOS 26.5.2.

Just curious, how fast exactly?

 

[mikelets456]

Weird, something changed as today my battery life was “normal”. Used my 16PM as I always do for work and I was at 79% when I left work at 5:30….usually I’m at 46% or so.

I know something changed with the app
Store yesterday…maybe that?

 

[Boardiesboi]

Just curious, how fast exactly?

10% drop with 1 hr 15 min screen on time.

 

[FeliApple]

10% drop with 1 hr 15 min screen on time.

On a Pro Max that’s very low, unless usage is really heavy (heavy like max brightness with camera or gaming).

I’m typically crossing the 3-hour mark on my 16 Plus on iOS 18, and heavier usage like outdoor use with some camera crosses the 2-hour mark typically.

 

[Boardiesboi]

On a Pro Max that’s very low, unless usage is really heavy (heavy like max brightness with camera or gaming).

I’m typically crossing the 3-hour mark on my 16 Plus on iOS 18, and heavier usage like outdoor use with some camera crosses the 2-hour mark typically.

It's really noticeable and annoying. Almost tempted to downgrade back to iOS 26.6.

 

[goldmac2006]

It's really noticeable and annoying. Almost tempted to downgrade back to iOS 26.6.

Wasn’t it indexing for Siri AI? Folks hate it when it comes to battery drain

 

[Boardiesboi]

Wasn’t it indexing for Siri AI? Folks hate it when it comes to battery drain

Nah that stopped like a week ago

 

[goldmac2006]

🤯 still 90% since I was on iOS 26 !!!!

 

[goldmac2006]

Nah that stopped like a week ago

Adaptive power on or off on the iPhone 17PM?

 

[Boardiesboi]

Adaptive power on or off on the iPhone 17PM?

Off. Never had it on before. Does it actually work or save battery?

 

[goldmac2006]

Off. Never had it on before. Does it actually work or save battery?

In my view, most participants in my iOS 26 battery life thread of yesteryear suggest it is not worthwhile. I posed the same question to Apple geniuses, who agreed it feels like a gimmick; in my personal use on the 15 Pro, it degrades the refresh rate and dims the screen excessively.

By default, all iPhone 17 models activate adaptive power mode. On iPhone 15 Pro through 16 models, it remains off unless chosen. This feature is intended for Apple Intelligence to balance battery life and preservation, yet in my opinion it performs little better than its stated ATM