Help Smartphone charges very slowly

[MandarksLab]

My Wileyfox Swift 2 Plus started having troubles with charging about a month ago. Sometimes when I plugged it into the charger, it would stop charging, especially if the cable moved a bit.

So I purchased a new cable and a charger, but the problem still existed and got worse.
The smartphone wouldn't even charge for days on end. I finally did a full factory reset and wipe cache partition but this did not fix the problem.
I use the app Ampere to see how fast it is charging, but it's around 10 to 400, though most of the time below 200, or 50, and it also stops charging competely sometimes.

What could be the problem for this?
Unfortunately, I just exceeded the 6 months of battery warranty so I can not send it in for repair without cost.

The charger I use is a USB quick charge 2.0.
15 Watt
Voltage: 5 V, 9 V, 12 V
Ampere: 3 A, 1.66 A, 1.25 A
I am from The Netherlands so the voltage is 230.

The cable I use is: USB-C cable - USB 2.0 to USB 3.1 Type-C

Do I need a different charger or is this one fine for my Wileyfox?

Phone battery specs:

• Size - 2700mAh
• Type - Polymer

 

[AZgl1500]

I have a Samsung Note 4, that is doing much the same.

I think the battery(s) I have are "end of life"...

I ordered two new ones from fleabay, but I got two of them for less than the price of a new Samsung from a local retailer.... I suspect they were junk before I got them home....

the battery in it now won't charge above 65%, another battery won't charge above 40%, and a 3rd one is much the same.

I suspect you need to get a new quality OEM battery for the phone.
just like I do....

 

[MandarksLab]

I have a Samsung Note 4, that is doing much the same.

I think the battery(s) I have are "end of life"...

I ordered two new ones from fleabay, but I got two of them for less than the price of a new Samsung from a local retailer.... I suspect they were junk before I got them home....

the battery in it now won't charge above 65%, another battery won't charge above 40%, and a 3rd one is much the same.

I suspect you need to get a new quality OEM battery for the phone.
just like I do....

That won't be so easy. Wileyfox swift plus 2 does not open, so I can't replace the battery. I have to probably send it in for repair, but I need my phone plus I can't afford to pay a lot to get it fixed.