[kevinchen]

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.

[KaiserPro]

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

[kevinchen]

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.

[KaiserPro]

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