Is it alright if I didn't fully charge my iPhone 6s for the first time? - 1

Is it alright if I didn't fully charge my iPhone 6s for the first time? - 2

Added (1). I Just bought my new iphone 6s, the salesman told me to fully charge my phone, not 8 hours, but fully charge after it drops 20%. Unfortunately I plugged in my phones to my laptop to restore backup then the phone charged until 40% and i unplugged it. After the battery drop to 20% and I fully charged it. Is it going to affect anything?

It probably won't be a problem for now, but you might have problems with the battery in the future.

Maybe…

but all rechargeables should be fully charged before use,
as the instructions tell you to do.

Failure to fully charge a battery before it is first used
can shorten its long-term useful life.

Thus you could pay for the impatience you have now
with frustration you would get later,
long after you've forgotten how it all started.

Modern lithium polymer batteries used in all iPhones can be charged as much or as little as you want, whenever you want, and will not suffer any adverse affects whatsoever.

But many years ago nickel cadmium (NiCad) rechargeables were widely used and they could suffer "memory effect" which reduced battery performance rapidly if the battery was not fully discharged each time before fully recharging.

In short, relax. You've done no harm of any kind to the total lifespan of your phone battery.

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