the answer from @cam2363 seems to be correct, that there is a problem with your Charging circuit rather than your battery itself. However, the repair is a large amount of money less than buying a 350$ phone. you can easily have a repair shop fix it for around 80-100$ (All of my costs are in CAD)
If you have experience with SMT Soldering, it is a simple enough procedure to do yourself, but if you have not, then i would suggest hiring a professional.
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To diagnose this issue, i would follow the steps below.
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1) Boost the battery externally with an external power source. (Ensure it is to the proper Voltage and Amperage that the battery takes. Does it turn on, and does it charge?
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-if it doesn't turn on, board failure.
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-if it turns on, Proceed
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2) Scan board for physical damage. should there be cany chips, scratches, or breaks in the device, then you will either need to replace these pieces (if you have the SMT Skill set)
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if there is no damage visible, then proceed.
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3) Plug in your charging cable. if it charges, all is good. if it does not, then replace the charging port. Re test the charging port.
the answer from @cam2363 seems to be correct, that there is a problem with your Charging circuit rather than your battery itself. However, the repair is a large amount of money less than buying a 350$ phone. you can easily have a repair shop fix it for around 80-100$ (All of my costs are in CAD)
If you have experience with SMT Soldering, it is a simple enough procedure to do yourself, but if you have not, then i would suggest hiring a professional.