Lithium-ion batteries, like the kind used in Samsung and Apple products fare better when they’re charged. If you constantly let them drain to 0%, they become unstable.
Your battery has a finite number of charge cycles, and every time it fully dies, that’s another cycle out the window.
How it work: Lets say your battery has 50 charge cycles. Each time you let your battery drain to 0%, 1 out of 50 charge cycles has been lost.
Also, charging your phone’s battery from a low 25% charge to 100% will reduce its capacity and shorten its lifespan.
In fact, charging from pretty much any amount to 100% is a bad idea. According to Battery University, lithium-ion batteries does not need to be fully charged, nor is it desirable to do so.
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