Disabling Wi-Fi and Bluetooth doesn't save as much battery as you think

I've seen people keep their Wi-Fi and Bluetooth off and then turn them on each time they need to use a Bluetooth device or connect to a wireless network. When asked why, the most common answer is battery life. But are the gains from turning off Bluetooth and Wi-Fi big enough to be worth the hassle of having to constantly turn them on and off?

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