Comment by zwily
8 years ago
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.
8 years ago
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.
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> 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).