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Lately, when I unplug my phone from the charger, it starts restarting over and over until I plug it back in to a charger. I notice that the battery percentage drops drastically when I unplug it from the charger. Like from 98% to 64%. Does anyone know what is causing this and/or how to fix it, if it is fixable?
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From your description, the first thing I'd do is replace the battery. Phones can exhibit strange behavior when they can't communicate with the BMS, or Battery Management System circuit on the battery itself. That could account for the charging issues as well.
Unfortunately, iFixit isn't strong on Samsung phones and doesn't have a guide for yours, but the Spanish site Nadie Me Llama Gallina has just what you need.
Manuals / Samsung Galaxy A54 5G / Battery - Nobody Calls Me Chicken
If that doesn't do the job, the charging circuit in the daughter card would be the next thing to try.
Manuals / Samsung Galaxy A54 5G / Auxiliary Board - Nobody Calls Me Chicken
Neither of those parts should be particularly expensive, so if it was my phone I'd try them in that order. If those two still don't fix the problem, come on back and let us know everything you've done and what happened and we'll see if we can offer further help.
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