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The Xperia XZ1 estimates how long your battery will last, based on how you normally use your phone.
If it thinks you’re going to run out of power later in the day, it prompts you to activate STAMINA mode.
STAMINA mode cuts energy consumption, so your battery lasts all day.
Leaving a fully-charged battery plugged in can damage it. Battery Care charges your phone to 90%, waits, then charges to 100% just before your wake-up time.