In our tests, both iPhones and Android smartphones used significantly less battery power with battery-saver mode enabled—as much as 54 percent, depending on the phone we used. While both airplane mode and low-power mode conserve battery life, they do so at a heavy price.

Is it OK to turn on battery saver all the time?

There's no harm in using Battery Saver mode, but you do lose features while it's activated, including GPS and background syncing.

What are the disadvantages of battery saver?

Battery Saver mode isn't something you want enabled all of the time. While more battery life sounds great, turning off these features comes with significant downsides. This mode lowers performance, prevents background sync, and limits GPS access.