Batteries for these models are very prissy and usually die a lot even from minor liquid damage.
However, the charging circuit could be damaged as well, and may produce the same symptoms.
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Just this week I fixed 3 of those. One needed a battery while the second needed board repair and both were not charging; the third needed both :)
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But all the wet retina models that I fixed needed a new battery. Whether only or in addition to board repair. The non retina, I'm yet to see one damaged from liquid spill.
First try an SMC reset. If no change, take it to Apple and let them examine it.
If they quote a top case, you need a battery.
If they quote a main board, you need a logic board repair service.
If they quote both, you need both obviously.
Or send it to a reputed repair store that will examine it and quote for you the needed.
Look up my profile, you have a link to a website with repair technicians who can perform this for you, if you'd like a few suggestions.
Batteries for these models are very prissy and usually die a lot.
However, the charging circuit could be damaged as well, which may produce the same result.
First try an SMC reset. If no change, take it to Apple and let them examine it.
If they quote a top case, you need a battery.
If they quote a main board, you need a logic board repair service.
If they quote both, you need both obviously.
Or send it to a reputed repair store that will examine it and quote for you the needed.
Look up my profile, you have a link to a website with repair technicians who can perform this for you, if you'd like a few suggestions.