Did you maybe consider to clean your USB-Connector, as I just wrote in the posted topic and did myself (at least semi-) successful?
As background information:
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I had problems while charging: charging process starts and stops if I just wobble/bend/touch the cable slightly (which other users also reported and mostly assuming a broken connector)
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I did a measurement with a external power meter while charging. Results:
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While correct charging with the original FP charger it should consumes 5.5 Watts while showing the charging animation
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BUT: the charging animation also is running, when the charger only consumes 2 or even 0.4 Watts or less, if before I moved the cable to another position (assuming a bad contact due to dust)
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Conclusion: A charging animation does not necessarily means a proper charging and having plugged in the phone over night does not necessarily mean a full chargerd phone, IF the CONNECTOR is DUSTY (or really loosen/broken)
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After the cleaning procedure I can provoke a bad charging (<2Watts) only with one cable position. Which means an improvement, but not yet a full solution. Mabe I missed some more dust or demeaged anythin. I will stay at this problem!
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@evidemment, could mean for you: maybe your connector is dusty, the phone does only get very weak electrical connection, just enough to enable charging animation. Due to wrong charging status or the long lasting but not well establish voltage of the charger your battery indicator goes just temporaly to 44% bevor remembers it was not chargerd properly.
Cheers, Robert