My battery has been performing badly these last few months. So today I visited Apple Store in Singapore to consult with the tech support. He said there are many factors causing battery to perform poorly. He then asked what my power bank I use. I showed him mine (Anker A1230 Powercore II 10000), then he said that this was not the right power bank for iphone X, because the voltage is too high.
Is this true? I’m pretty sure he’s wrong though, because I’ve searched the reviews of this product and many are from iphone owners. Also I think that latest iphones can handle up to 20 volts?
While I think the apple tech guy might be wrong, at the same time I felt since using my anker powerbank (3 days ago), my battery drops even more significant than usual. 100% at night before I went to sleep, and could be 60% in the morning.
Is there any relation between anker power bank and iphone battery dropping? My current battery health (in iphone setting) is at 84%.