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Comment by jasonthevillain | Hacker News Reader

Well, that explains the battery life tanking.

Battery life is always bad right after installing a new major iOS release. Every time. Give it a couple days, it’ll probably be fine. Most of the time, turning off wifi to preserve battery is more superstition than real.

In fact, turning off Wi-Fi can hurt battery life. LTE requires more power, GPS kicks on more often, and if you have an Apple Watch, data transfer is forced to use Bluetooth which means both devices remain in a high powered state for longer.

Bluetooth is an order of magnitude less power per KB than wifi

Yes but it’s slow. While your Bluetooth is transferring the data slowly, the entire rest of the system is burning power while it waits.

depends on the sleep states, and how much data is shifted.

> Most of the time, turning off wifi to preserve battery is more superstition than real.

This is not true in my experience. Having the WiFi radio on while network connectivity (including LTE/3G) isn't used hurts the battery runtime. It may be true for Bluetooth Low Energy, but not WiFi. Even when "disconnected" from a network, the WiFi radio now keeps looking for networks soon after the disconnect (I did see a "searching for network" message below the WiFi button in Control Center).

I'm not too keen to hear this news, but there is a tradeoff in that now you can quickly enable low power mode from control center. I still would like a way to entirely disable these connections at times, but in terms of battery there's a bit of give and take.

You could always quicky toggle Low Power mode w Siri.

What really makes voice interfaces superior, IMHO, is the degradation of the UI.

By making one worse, the other is relativily better.

Don’t try to tell that to the iOS Beta subreddit on reddit. They swear up and down that there is absolutely no battery loss from having your WiFi and Bluetooth enabled even when not connected. To even question this is considered heresy.

That’s because the only battery loss is negligible

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