
My 15W MagSafe-compatible power bank keeps showing a ‘Slow Charger’ warning.
So I bought the 10,000mAh TOTU power bank (PB-1008, to be specific). It doesn’t have Qi certification, but the build quality is really good, it was quite cheap, and it supports 20W Power Delivery through the USB-C port. That’s why I preferred it over other power banks.
However, I’m having an issue with wireless charging. Whenever I attach the power bank to the back of my phone, it initially shows a normal charging speed, but after 1–2 minutes, it flags the power bank as a “Slow Charger” and shows a much longer estimated charging time, sometimes over an hour. Interestingly, sometimes it shows a really good charging speed, almost as fast as wired charging, but the “Slow Charger” warning still doesn’t disappear.
Is my power bank defective, or does this warning appear with every wireless power bank that doesn’t have Qi certification?