Battery, mac book pro, last night i had a full charge and woke up to a red light at 93%

my battery has been replaced once, seems to be fine, until just recently, at my cabin out of phone service area, charged my laptop to 100, and in the morning it was at 90% usually stays plugged in with a full charge all the time, checked power in system info battery says normal, does it sound like natural battery wear??????? replaved the battery 2 years ago........ any thoughts would help,,,, OCD geeez, jason

It's normal. The battery will charge to 100% and then stop charging, until its charge state reaches several percent less, after which it will charge again.
This is an intentional design consideration, to maximize your battery's longevity.
im also in an area where my phone drains quickly as its looking for service, comes in and out, airplane mode fixed that
Are you asking about your MacBook Pro, or an iPhone? The answer is the same in either case, but an iPhone will consume more power in an area of weak cell service.

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