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Why does my phone discharges whenever I charge with a powerbank?

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My phone doesn’t charge with a powerbank, it rather discharges. But this is not the case if it is connected to a socket.

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2 Answers

  1. Fake low quality power banks can cause your battery to discharge and eventually spoil your phone battery. This is because they don’t have a logical chip that listens to your phone while it is charging it unlike a charger. Many Chinese large MAH, cheap power banks using Chinese unbranded batteries and low quality circuits will kill your phone batteries or even cause them to blow. Go for high quality power banks like; Sony cycle energy and original Xiaomi power banks. Xiaomi power banks uses Texas Instrument chip that listens to your phone battery while charging it, with high quality LG or SAMSUNG batteries. Not unbranded Chinese batteries like some inferior power banks.

  2. Any powerbank with USB-A sockets will only push power out through the charging ports – USB-A has no support for power in the other direction. A powerbank with USB-C could conceivably draw power from a USB-C phone, but the USB-C spec includes enough intelligence that a powerbank can identify itself as a power source and not a device that needs powering from what it is connected to. So it’s technically possible that a ridiculously badly programmed USB-C power bank might end up doing the wrong thing, and a USB-C phone with power USB-C peripherals enabled in settings might try to charge it.