Low Battery Forever

I have a meizu M6 sp version. It worked perfectly until a few days ago. Now every time I turn it on it says low battery and shuts off. I charge it off course to no avail. Help!

Either no charge is getting to the battery during the charge cycle or the battery has collapsed.

If it is a charging problem try a different USB cable.
Try charging using a different USB port (Avoid using a hub as this may diminish the voltage)

If the battery has failed then there is not much you can do other than getting the battery replaced and you would need to contact your seller for return to Meizu which can take around 3 months.

Sadly because the battery is not a standard size you can not buy replacements for self install.

As my player was over 12 months old when I started having battery problems I felt it was not worth sending back for a replacement so I piggy backed an iPod battery onto the back of it.
Photos as requested

I dunno, I enjoy making things and i have the time and patience to learn. Can you tell me how you did that, I can definitely get another mp3 player battery from a different type of player.