Phone only charges with 2.1A

[AlleWigh]

Hello!
I have a Sony xperia Z5 and it just stopped charging with my wall charger. When I connect it, it sounds like it's charging and if the screen is off it turns on. So I tried another charger and cord but with the same result. But the stange thing is that i can charge it with the 2.1A on my power bank or an iPad charger with 2.1A.

I can't figure out why it does that and nobody seems to have the same problem.

 

[N4Newbie]

Is the phone on or off while charging?

Most modern phones, when off, take forever to charge when connected to a USB1.x/2.x port on a PC and will actually continue to discharge if on. Older model car chargers will also cause a phone to continue to discharge if you are using a mapping app or doing nearly anything else on the phone while it is "charging.

All this leaves me wonder if your phone is running anything when connected to the charger. In your experience, is the 2.1 amp charger charging the phone as quickly as it used to in the past? Have you checked the battery stats to see what apps are consuming battery?

 

[smvim]

Looking up the specs on your phone it has a 2900mAh battery:
Sony Xperia Z5 - Full phone specifications
Converting that to amps, that's 2.9A, and with a large number of phone power adapters being in that 2.1A range that's a suitable combination. Also keep in mind that a smartphone battery won't be pulling that full amount of amperage the entire time it's being charged -- it will use more current early on and as the battery gets charged back up it tapers off. But it's still better to have a higher amp rated power adapter, an older, lessor 1A charger will suffice but it's just going to take longer. If you're using a computer/laptop USB port, it can get more complicated. Older USB 2.x ports will typically be restricted to supplying only 500mA (1/2 an amp), unless it's a dedicated power port where it will be able to supply more. USB 3.0 can supply up to 900mA, but 3.1 and higher versions quite a bit more (5A) so you have to determine the port version.
Stick with a higher quality USB cable, cheaper ones often consist of lower quality and thinner gauge wires. Higher gauge (thicker) wire is directly related to being able to use higher current.