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my 1 day old iPhone 12 charge at 1:40pm at 20%
upon checking at 2:40 it’s already reach 80%
then until now it’s 80%.what seems to be the problem.
i already reset the setting but it’s the same.
[Re-Titled by Moderator]
Your Apple lithium-ion battery uses fast charging to quickly reach 80% of its capacity, then switches to slower trickle charging. The amount of time it takes to reach that first 80% will vary depending on your settings and which device you’re charging. Software may limit charging above 80% when the recommended battery temperatures are exceeded.
https://www.apple.com/batteries/why-lithium-ion
Hope this helps and solves your question. Do not hesitate to ask if you need more information.
Bodyxs 
Your Apple lithium-ion battery uses fast charging to quickly reach 80% of its capacity, then switches to slower trickle charging. The amount of time it takes to reach that first 80% will vary depending on your settings and which device you’re charging. Software may limit charging above 80% when the recommended battery temperatures are exceeded.
https://www.apple.com/batteries/why-lithium-ion
Hope this helps and solves your question. Do not hesitate to ask if you need more information.
Bodyxs 
Mona ~ If it stays at 80% it's probably due to this being set to On:
Settings > Battery > Battery Health > Optimized Battery Charging
About Optimized Battery Charging on your iPhone - Apple Support
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iPhone 12 charged 60% in 1 hour
