Battery not charging

Just purchased this tablet from Wish and having battery charging issues. When it arrived it was at 62%. I let it charge for several days and it climbed all the way to 63%, used it for an hour and it went to 41%. It is now at 30% after being turned off and charged continuously for 2 days. What is my next step. I like the tablet but cannot use it much longer in its present condition?

Just an attempt
Make a factory reset from Android settings.
If the problem is not corrected, return the tablet to the seller

I’ve been encountering this issue too with my OPPO smartphone. I did factory reset but still the same :frowning:

Hello is what you have to buy things or Chinese brands, in the long run you pay more than you, better buy in your country and that is not Chinese or Korean or Japanese